frighteners
noun [ plural ] UK old-fashioned uk/ˈfraɪ.tən.əz/ us/ˈfraɪ.tən.ɚz/
put the frighteners on someone 威胁（某人）
to threaten someone
He said he wouldn't pay up so I sent my brother round to put the frighteners on him. 他说他不还钱，所以我让我弟弟去逼他还。