thick as thieves

to be tight or best friends with someone

josh and maddy are thick as thieves fool

by jsack January 20, 2009

thick as thieves

A special bond people have for each other.
Derived from the idea of "partners in crime".

Ant and Chris, having attended boarding school together, were thick as thieves.

by DDA September 6, 2005

Thick as Thieves

People who are good friends.

Ant and Chris, having attended boarding school together for so many years, were thick as thieves.

by DDA July 18, 2008