be (as) thick as thieves
be (as) thick as thieves
To be very close friends. Anna and Beth are together all the time these days—they're as thick as thieves.
See also: thick, thief
Farlex Dictionary of Idioms.
- (as) thick as thieves
- come thick and fast
- thick
- (as) thick as pea soup
- thick as pea soup
- pea souper
- plank
- (as) thick as a short plank
- thick as a short plank
- two