Top Definition
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 August 26, 2005
to be tight or best friends with someone
josh and maddy are thick as thieves fool
by jsack January 20, 2009
People who are good friends.
Ant and Chris, having attended boarding school together for so many years, were thick as thieves.
by DDA August 26, 2005

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