keep (something) under one's hat

idiom

Definition of keep (something) under one's hat 

: to keep (something) secret : to not tell anyone about (something) I'll tell you what happened, but you have to keep it under your hat.

Learn More about keep (something) under one's hat

Share keep (something) under one's hat

Resources for keep (something) under one's hat

Statistics for keep (something) under one's hat

Look-up Popularity

Comments on keep (something) under one's hat

What made you want to look up keep (something) under one's hat? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a generally accepted meaning of a word

Get Word of the Day daily email!

Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble-tiles-that-read-scrabble-quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!