be (as) thick as thieves
US /bi əz θɪk əz θiːvz/
UK /bi əz θɪk əz θiːvz/
1.
아주 친한 친구, 죽마고우
to be very close friends and share secrets, often in a way that excludes others
:
•
Those two have been as thick as thieves since childhood.
그 둘은 어릴 때부터 아주 친한 친구였다.
•
The new neighbors are already as thick as thieves with the family next door.
새 이웃들은 이미 옆집 가족과 아주 친한 친구가 되었다.