thick as thieves

idiom
Updated on: 15 Nov 2017

Definition of thick as thieves

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

Word by Word Definitions

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

  2. : heavily built : thickset

  3. : close-packed with units or individuals

  1. : in a thick manner : thickly

  1. : the most crowded or active part

  2. : the part of greatest thickness

thief play thieves
  1. : one that steals especially stealthily or secretly


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