What is Flush ?
Flush is (noun) 1. a red colour on the face a flush of anger 2. a quick flow of water 3. (at cards) a hand in which all the cards are of the same suit She is holding a flush. (NOTE: The plural is flushes.) (verb) 1. to go red in the face She flushed with pleasure when she heard the results. 2. to flush out to drive out of hiding The army brought in helicopters to flush the guerrillas out of their mountain bases. (adj) 1. flush with level with The door must be flush with the wall. 2. having plenty of money to spend (informal.) I’ve just been paid, so I’m feeling very flush at the moment.
source: Easier English, Student Dictionary Upper Intermediate Level