blow the whistle

Etymology
When used idiomatically, probably an allusion to a police officer blowing his or her whistle on observing a violation of the law.

Verb

 * 1)  To disclose information to the public or to appropriate authorities concerning the illegal or socially harmful actions of a person or group, especially a corporation or government agency.
 * In some jurisdictions, it is illegal to fire a person for blowing the whistle on an employer.
 * 1)  To make a piercing sound which signals a referee's action or the end of a game.

Synonyms

 * , ; See also Thesaurus:rat out

Translations

 * Chinese:
 * Mandarin:, , ,
 * Finnish:, antaa ilmi
 * French:, , ,
 * German: ,
 * Portuguese:
 * Russian:
 * Spanish:, dar el soplo


 * Chinese:
 * Mandarin:
 * Finnish:, puhaltaa pilliin
 * French:
 * German: ,
 * Portuguese:
 * Russian:
 * Spanish: