rat on

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


Nearby words

  1. rat claw foot,
  2. rat fink,
  3. rat guard,
  4. rat islands,
  5. rat kangaroo,
  6. rat pack,
  7. rat race,
  8. rat snake,
  9. rat tamer,
  10. rat terrier

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