thick as thieves


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*thick as thieves

Cliché very close-knit; friendly; allied. (Thick = close and loyal. *Also: as ~.) Mary, Tom, and Sally are as thick as thieves. They go everywhere together. Those two families are thick as thieves.
See also: thick, thief

thick as thieves

Intimate, closely allied, as in The sisters-in-law are thick as thieves. This term uses thick in the sense of "intimate," a usage that is obsolete except in this simile. [Early 1800s]
See also: thick, thief
References in periodicals archive ?
The mates were thick as thieves at a launch party for Sony Ericsson at Baker Street in London on Tuesday.
Construction firm boss Craig Porter, of Edinburgh, said: "Gail and her brother have always been as thick as thieves so I wasn't surprised when she said she was thinking of asking Keith to give her away.
Lead singers Thom Yorke and Jack White were as thick as thieves at the bash.
Noel was joined by Paul Weller for the Modfather's Come On/Let's Go and Jam classic Thick As Thieves.
HERE are ZOE Ball and best pal Sara Cox looking as thick as thieves at Glastonbury yesterday - but Zoe's husband Fatboy Slim won't be sticking this photo in the family album.
The pair were as thick as thieves at the filming of C5's Pepsi Chart Show at London's Sound Republic on Tuesday night.
The three piece promise the raw energy of the early Jam with best known classics including as Down in the Tubestation at Midnight, Start, Eton Rifles and Thick as Thieves.