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rat on

Betray a comrade by giving information, as in He ratted on his best friend to the police. [Slang; early 1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for rat on

squawk, reveal, disclose, acknowledge, confide, prove, divulge, concede, assert, relate, recognize, profess, declare, leak, confess, tip, tattle, betray, blab, tell