as good as gold
idiomPart ofgold
as good as gold — idiom
1. behaving very well, especially used to describe a child who is obedient, polite,
1.idiom
Definition
behaving very well, especially used to describe a child who is obedient, polite, and causes no trouble.
Example
The babysitter said the children were as good as gold and went to bed without any fuss.
Our puppy was as good as gold during the trip to the vet — he did not move once.