This is the 5873rd most frequent Chinese word.
坐牢
"坐牢" means "to be in prison" or "to serve a prison sentence."
Here, '坐牢' means 'to be imprisoned', indicating a state or action following a crime.
他因为犯罪而坐牢了三年。
He was imprisoned for three years due to committing a crime.
In this sentence, '坐牢' is used as a noun phrase meaning 'imprisonment'.
坐牢是他的合法惩罚。
Imprisonment is his lawful punishment.
Here, '坐牢' is used in a colloquial context, referring to someone's temporary situation of being in prison.