thick as thieves

Definition of thick as thieves

  1. :  very close and secretive They were (as) thick as thieves for weeks, which made us wonder what they were doing.

Word by Word Definitions

thickplay
  1. :  having or being of relatively great depth or extent from one surface to its opposite

    :  heavily built :  thickset

    :  close-packed with units or individuals

  1. :  in a thick manner :  thickly

  1. :  the most crowded or active part

    :  the part of greatest thickness

thiefplay thieves
  1. :  one that steals especially stealthily or secretly

    :  one who commits theft or larceny


Seen and Heard

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