blow the whistle on


Expose corruption or other wrongdoing, as in The President's speech blew the whistle on the opposition's leaking information. [Colloquial; 1930s]

Words Nearby blow the whistle on

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