The difference between Hang on and Stand by
When used as verbs, hang on means to wait a moment (usually imperative), whereas stand by means to wait in expectation of some event.
check bellow for the other definitions of Hang on and Stand by
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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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Stand by as a verb (idiomatic, intransitive):
To wait in expectation of some event; to make ready.
Examples:
"Please stand by for more instructions."
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Stand by as a verb (idiomatic, transitive):
To remain loyal or faithful to.
Examples:
"Even though money is scarce sometimes, Ann stands by her decision to be a full-time mother."
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Stand by as a verb (idiomatic, transitive):
To support; to continue to support despite things being bad.
Examples:
"They stood by us all along and it's awesome to see them out here to support us today."
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Stand by as a verb (intransitive):
To do nothing. To be inactive in a situation.
Examples:
"I can't simply stand by and watch you ruin your life."
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Stand by as a verb (intransitive):
to be ready to provide assistance if required.
Examples:
"The tug stood by in case it was needed."