grass up
片語動詞所屬單字grass
grass up — 片語動詞
1. to report someone's criminal activity to the police, often used in informal Brit
1.片語動詞
釋義
出賣；告密（向警方檢舉）
to report someone's criminal activity to the police, often used in informal British English.
例句
Nobody in the neighbourhood would grass him up even though everyone knew what he had done.
Leo was afraid that his former partner would grass him up to avoid going to prison alone.