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1.
to inform on, tell on, expose
Don't dime out dat boy, he didn't do anything wrong!
by angelav October 03, 2008
 
2.
used by will smith in his show The fresh Prince of Belair meaning selling some one out.
"man why did you dime him out like that to his parents?" (dime out goes around the person)
by dancingdiva909 May 30, 2006