The difference between Thumb and Thumby
When used as nouns, 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, whereas thumby means a little thumb.
Thumb is also verb with the meaning: to touch or cover with the thumb.
Thumby is also adjective with the meaning: clumsy, awkward, maladroit, not dextrous, all thumbs.
check bellow for the other definitions of Thumb and Thumby
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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.
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Thumby as a noun (slang):
A little thumb;
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Thumby as an adjective:
Clumsy, awkward, maladroit, not dextrous, all thumbs
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Thumby as an adjective:
Dirtied by thumb marks