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.
(..) Do you smell something? - Yeah. - Smoke. Yeah. Definite smoke. Look, it's a fire! Holy cow, look at that! - It's my father's cabin! - The cabin is on fire. I just realized, you never gave me back the change from the tolls. How could this have happened? (..)1992 TvShow: Seinfeld Title: The Bubble Boy Season: 4 Episode 7