– Manuscript – Welcome to English in a Minute! Thieves steal things and should not be trusted. But, do thieves trust other thieves? That brings us to the expression: Thick as Thieves Speaker A: I need to invite Ashley to Caty's surprise birthday party.Speaker B: Uh-oh. Problem.Speaker A: Why is that a problem?Speaker B: Dan, those two are thick as thieves. It's like … [Read more...] about Thick as Thieves (Idioms)