Thick as Thieves

What Does "Thick as Thieves" Mean?
"Thick as thieves" is an English idiom describing a close and secretive relationship between people, often implying they are involved in some shared scheme or activity.Examples in Sentences
Here are three examples of the idiom "thick as thieves" used in a sentence:- Those two have been friends for years; they're thick as thieves.
- They looked suspiciously close, like they were thick as thieves.
- The siblings were thick as thieves growing up.
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