idioms

cash cow (something that always makes a lot of profit) His latest investment turned out to be a cash cow. He owns a restaurant, which is a cash cow for him. envocabulary.com

call off the dogs (stop criticizing or attacking someone) Please call off the dogs. I apologize for not telling you on time. All right, now that you know I’m not lying, you can call off the dogs.   envocabulary.com

cat got your tongue (why do you have nothing to say? why are you quiet?) Tell me who broke the clock. What’s the matter, cat got your tongue? Use your brain and say something. Cat got your tongue?   envocabulary.com

  a vegetable (a person who is alive but is unable to think or move correctly because of brain damage) The accident turned him into a vegetable. (a person who has a boring or inactive life) Being at home all day watching TV eventually turned me into a vegetable. envocabulary.com

bread and butter (main source of income) Tourism is this country’s bread and butter. (very important; most basic) The government is concentrating on bread-and-butter issues such as jobs and housing.   envocabulary.com