Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

on the sly

Definition of on the sly

informal

  1. :  in a secret way :  secretly <They've been meeting each other on the sly.>



Word by Word Definitions

  1. :  wise in practical affairs

    :  displaying cleverness :  ingenious

    :  clever in concealing one's aims or ends :  furtive


Seen and Heard

What made you want to look up on the sly? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to lessen in amount, effect, or force

Get Word of the Day daily email!