They were 'cowed' into silence by threats. [=they did not complain, publicly say anything, etc., because they had been threatened]
They'll be arguing about this 'till the cows come home'.
The football team was a 'cash cow' for the university.
(..) (CHUCKLES) I like to hear them scream. (SOBS) (LAUGHING) Why don't you just leave us alone? Shut up, you old cow! (JANET PANTING) Janet, darling. Darling, are you all right? (IN NORMAL VOICE) I'm sorry. Janet. (..)2016 The Conjuring 2