from Wiktionary, Creative Commons Attribution/Share-Alike License.
- verb idiomatic To
disclose informationto the publicor to appropriate authoritiesconcerning the illegalor socially harmfulactions of a person or group, especially a corporationor government agency.
- verb team sports To make a piercing sound which
signalsa referee's action or the end of a game.
from Wiktionary, Creative Commons Attribution/Share-Alike License
When used idiomatically, probably an allusion to a police officer blowing his or her whistle on observing a violation of the law.
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