The difference between Hang on and Keep
When used as verbs, hang on means to wait a moment (usually imperative), whereas keep means to continue in (a course or mode of action).
Keep is also noun with the meaning: care, notice.
check bellow for the other definitions of Hang on and Keep
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Hang on as a verb (idiomatic):
To wait a moment (usually imperative).
Examples:
"'Hang on. Let me check."
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Hang on as a verb:
To hold, grasp, or grip.
Examples:
"'Hang on to the handle so you don't drop it."
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Hang on as a verb (idiomatic):
To keep; to store something for someone
Examples:
"'Hang on to my jacket until I get back."
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Hang on as a verb (idiomatic):
To pay close attention.
Examples:
"The audience hangs on his every word."
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Hang on as a verb (idiomatic):
To continually believe in something; to have faith in.
Examples:
"He's got a philosophy he hangs on to."
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Hang on as a verb (idiomatic):
To persevere.
Examples:
"Just hang on and keep going; this pain won't last forever."
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Keep as a verb:
To continue in (a course or mode of action); not to intermit or fall from; to uphold or maintain.
Examples:
"to keep silence;  to keep one's word;  to keep possession"
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Keep as a verb (transitive):
To hold the status of something. To maintain possession of. To maintain the condition of. To record transactions, accounts, or events in. To enter (accounts, records, etc.) in a book. To remain in, to be confined to. To restrain. To watch over, look after, guard, protect. To supply with necessities and financially support a person. To raise; to care for. To maintain (an establishment or institution); to conduct; to manage. To have habitually in stock for sale.
Examples:
"I keep a small stock of painkillers for emergencies."
"I keep my specimens under glass to protect them."
"The abundance of squirrels kept the dogs running for hours."
"I used to keep a diary."
"I keep my brother out of trouble by keeping him away from his friends and hard at work."
"May the Lord keep you from harm."
"He kept a mistress for over ten years."
"He has been keeping orchids since retiring."
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Keep as a verb (intransitive):
To hold or be held in a state. To reside for a time; to lodge; to dwell. To continue. To remain edible or otherwise usable. To remain in a state.
Examples:
"She kept to her bed while the fever lasted."
"I keep taking the tablets, but to no avail."
"Potatoes can keep if they are in a [[root cellar]]."
"Latex paint won't keep indefinitely."
"The rabbit avoided detection by keeping still."
"'Keep calm! There's no need to panic."
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Keep as a verb (obsolete):
To wait for, keep watch for.
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Keep as a verb (intransitive, cricket):
To act as wicket-keeper.
Examples:
"Godfrey Evans kept for England for many years."
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Keep as a verb (intransitive, obsolete):
To take care; to be solicitous; to watch.
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Keep as a verb (intransitive, obsolete):
To be in session; to take place.
Examples:
"School keeps today."
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Keep as a verb (transitive):
To observe; to adhere to; to fulfill; not to swerve from or violate.
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Keep as a verb (transitive, dated):
To confine oneself to; not to quit; to remain in.
Examples:
"to keep one's house, room, bed, etc."
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Keep as a verb (transitive, dated, by extension):
To visit (a place) often; to frequent.
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Keep as a noun (obsolete):
Care, notice
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Keep as a noun (historical):
The main tower of a castle or fortress, located within the castle walls.
Examples:
"synonyms: donjon"
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Keep as a noun:
The food or money required to keep someone alive and healthy; one's support, maintenance.
Examples:
"He works as a cobbler's apprentice for his keep."
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Keep as a noun:
The act or office of keeping; custody; guard; care; heed; charge.
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Keep as a noun:
The state of being kept; hence, the resulting condition; case.
Examples:
"to be in good keep'"
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Keep as a noun (obsolete):
That which is kept in charge; a charge.
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Keep as a noun (engineering):
A cap for holding something, such as a journal box, in place.