The difference between Drop a dime and Grass up
When used as verbs, drop a dime means to make a telephone call, usually calling authorities to report another's activities, whereas grass up means to betray by informing on.
check bellow for the other definitions of Drop a dime and Grass up
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Drop a dime as a verb (idiomatic, slang):
To make a telephone call, usually calling authorities to report another's activities.
Examples:
"He was in the back for a few minutes. Turned out he was dropping a dime on Ralph."
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Drop a dime as a verb (slang, with ''on''):
To inform (on).
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Grass up as a verb (UK, slang):
To betray by informing on.