The difference between Hand and Thumb
When used as nouns, hand means the part of the fore limb below the forearm or wrist in a human, and the corresponding part in many other animals, whereas thumb means the short thick digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers.
When used as verbs, hand means to give, pass, or transmit with the hand, literally or figuratively, whereas thumb means to touch or cover with the thumb.
check bellow for the other definitions of Hand and Thumb
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Hand as a noun:
The part of the fore limb below the forearm or wrist in a human, and the corresponding part in many other animals.
Examples:
"Her hands are really strong."
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Hand as a noun:
That which resembles, or to some extent performs the office of, a human hand. A limb of certain animals, such as the foot of a hawk, or any one of the four extremities of a monkey. An index or pointer on a dial; such as the hour and minute hands on the face of an analog clock, which are used to indicate the time of day.
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Hand as a noun:
In linear measurement: Four inches, a hand's breadth. Three inches.
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Hand as a noun:
A side; part, camp; direction, either right or left.
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Hand as a noun:
Power of performance; means of execution; ability; skill; dexterity.
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Hand as a noun:
An agent; a servant, or manual laborer, especially in compounds; a workman, trained or competent for special service or duty; a performer more or less skillful.
Examples:
"an old hand at speaking;  large farms need many farm hands'"
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Hand as a noun:
An instance of helping.
Examples:
"Bob gave Alice a hand to move the furniture."
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Hand as a noun:
Handwriting; style of penmanship.
Examples:
"a good hand'"
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Hand as a noun:
A person's autograph or signature.
Examples:
"Given under my Hand and Seal of the State this 1st Day of January, 2010."
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Hand as a noun:
Personal possession; ownership.
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Hand as a noun (usually, in the plural, '''[[hands]]'''):
Management, domain, control.
Examples:
"in safe hands;  in good hands;  nowrap He lost his job when the factory changed hands.  nowrap With the business back in the founder's hands, there is new hope for the company.  nowrap With John in charge of the project, it's in good hands."
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Hand as a noun:
That which is, or may be, held in a hand at once. The set of cards held by a player. # A round of a card game. A bundle of tobacco leaves tied together.
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Hand as a noun:
Applause.
Examples:
"Give him a hand."
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Hand as a noun (historical):
A Native American gambling game, involving guessing the whereabouts of bits of ivory or similar, which are passed rapidly from hand to hand.
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Hand as a noun (firearms):
The small part of a gunstock near the lock, which is grasped by the hand in taking aim.
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Hand as a noun:
A whole rhizome of ginger.
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Hand as a noun:
The feel of a fabric; the impression or quality of the fabric as judged qualitatively by the sense of touch.
Examples:
"This fabric has a smooth, soft hand."
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Hand as a noun (archaic):
Actual performance; deed; act; workmanship; agency; hence, manner of performance.
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Hand as a noun (archaic):
Agency in transmission from one person to another.
Examples:
"to buy at first hand (from the producer, or when new);  nowrap to buy at second hand (when no longer in the producer’s hand, or when not new);  nowrap It's not a rumor. I heard it at first hand."
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Hand as a noun (obsolete):
Rate; price.
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Hand as a verb (transitive):
To give, pass, or transmit with the hand, literally or figuratively.
Examples:
"He handed them the letter. She handed responsibility over to her deputy."
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Hand as a verb (transitive):
To lead, guide, or assist with the hand; to conduct.
Examples:
"to hand a lady into a carriage"
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Hand as a verb (transitive, obsolete):
To manage.
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Hand as a verb (transitive, obsolete):
To seize; to lay hands on.
Examples:
"rfquotek Shakespeare"
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Hand as a verb (transitive, rare):
To pledge by the hand; to handfast.
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Hand as a verb (transitive, nautical, said of a sail):
To furl.
Examples:
"rfquotek Totten"
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Hand as a verb (intransitive, obsolete):
To cooperate.
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Thumb as a noun:
The short thick digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers.
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Thumb as a noun (computing):
The part of a slider that may be moved linearly along the slider.
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Thumb as a noun (colloquial, Internet):
A thumbnail picture.
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Thumb as a verb (transitive):
To touch or cover with the thumb.
Examples:
"to thumb the touch-hole of a cannon"
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Thumb as a verb (transitive, with '''through'''):
To turn the pages of (a book) in order to read it cursorily.
Examples:
"I thumbed through the book and decided not to bother reading it all."
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Thumb as a verb (travel):
To hitchhike
Examples:
"So I started thumbin' back east, toward my hometown."
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Thumb as a verb:
To soil or wear with the thumb or the fingers; to soil, or wear out, by frequent handling.
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Thumb as a verb:
To manipulate (an object) with the thumb; especially, to pull back the hammer or open the cylinder of a revolver.
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Thumb as a verb:
To fire (a single action revolver) quickly by pulling the hammer while keeping the trigger depressed.