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Related to as thick as thieves: as thick as two short planks, as keen as mustard, as thick as a brick
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Lead singers Thom Yorke and Jack White were as thick as thieves at the bash.
The saying as thick as thieves certainly applied to this raider when he ran straight through a reception door at Newcastle's Walbottle Technology College late last month.
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.