Definition of sail under false colours in English:

sail under false colours

Disguise one’s true nature or intentions: he felt the waiters could see that in his cashmere tweed jacket he is sailing under false colours
More example sentences
  • Their feeling of connectedness was so strong that Mimi felt an urge to tell her new friend that she too was sailing under false colours, but she feared to reveal this fact so early in their acquaintance.
  • I commented upon the fact that you are not Irish and as such are sailing under false colours.
  • So he's sailing under false colours - he's a theologian, not a sociologist.
See parent entry: colour

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day jaunty
Pronunciation: ˈdʒɔːnti
adjective
having a lively, cheerful, and self-confident manner...