Meaning of “flush” - Learner’s Dictionary

flush

verb uk us /flʌʃ/
TOILET [ I, T ]

If you flush a toilet, or if it flushes, its contents empty and it fills with water again.

flush sth away/down/out, etc

to get rid of something by pushing it somewhere with lots of water, such as down a toilet

FACE [ I ]

If you flush, your face becomes red and hot, usually because you are embarrassed or angry.

(Definition of “flush verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)