b) close friends
Well done ! That’s the right answer.
As thick as thieves describes a relationship between people that is very close. When people are as thick as thieves, they generally share confidences, spend a great deal of time together and are great friends.
French translation
s’entendre comme larrons en foire, être unis comme les doigts de la main, copains comme cochons
How NOT to translate : *épais comme des voleurs
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Examples in context
‘Thick as thieves from day one’ – Agnes and Angus prove 86-year age gap is no barrier to friendship.
The heartwarming bond between an Aberdeenshire youngster and a 92-year-old former teacher proves that friendship truly knows no bounds. Six-year-old Angus Johnson met Agnes Rae three years ago when Rothiemay and District Playgroup visited the Balhousie care home in Huntly, and the pair instantly became pals.’
The press & journal, 7th Nov. 2019
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’When Duchess Meghan and Prince Harry announced their engagement, he made a point of saying that she and his mother, Princess Diana, would have been “thick as thieves.”
We have to agree that they certainly would since they are alike in so many ways.’
Showbiz Cheatsheet, 23 Nov. 2019
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Everyday usage
Ant and Chris, having attended boarding school together for so many years, were thick as thieves.
I am sure she tells John everything we say – they are as thick as thieves, those two.
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