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.
(..) What did you think of that TV girl? - TV girl? Who? - You know who I mean. The one, "Did you just say no to me?" Her? Silly cow. Think she's hot? Don't you pause! What do you mean? You just paused! You can't say yes. She's OK. I think Gavino has a thing for her, actually. (..)2007 Goal II: Living the Dream