flushing I. adjective Etymology: from present participle of flush (V) 1.: serving to flush < a flushing mechanism > : used in or concerned with flushing 2.: of, relating to, or characterized by flushing; often: blushing • flush·ing·lyadverb II. noun (-s) Etymology: from gerund of flush (V) : transient reddening of the skin; sometimes: hot flash