A. keep down
Feedback keep down - 1. to prevent from growing. 2. to be able to digest food instead of vomiting while you're ill. 3. not to make noise. 4. to prevent people from being successful.
count on - to rely on somebody or something.
cut out - 1. to carve something 2. to stop doing something.
let out - 1. to make a loud sound 2. to loosen a piece of clothing 3. to take money from somebody for a rent. 4. to set somebody free