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[blow the
whistle on] {v. phr.}, {slang} 1. To inform against; betray.
The police caught
one of the bank robbers, and he blew the whistle on two more.
2. To act against,
stop, or tell people the secrets of (crime or lawlessness).
The mayor blew the
whistle on gambling.
The police blew the whistle on hot
reading.
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