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Adjective: thick as thieves
  1. (of people) very close or closely involved

Encyclopedia: Thick as thieves

Nearest

they're
they've
thiabendazole
thiamin
thiamine
thiamine pyrophosphate
thiazide
thiazine
Thibet
thick
thick as thieves
thick skin
thick-billed
thick-billed murre
thick-bodied
thick-branched
thicken
thickened
thickener
thickening
thicket