From The Collaborative International Dictionary of English v.0.48:
Flush \Flush\, v. i. [imp. & p. p. Flushed; p. pr. & vb. n. Flushing.] [Cf. OE. fluschen to fly up, penetrate, F. fluz a flowing, E. flux, dial. Sw. flossa to blaze, and E. flash; perh. influenced by blush. [root]84.] 1. To flow and spread suddenly; to rush; as, blood flushes into the face. [1913 Webster]
The flushing noise of many waters. --Boyle. [1913 Webster]
It flushes violently out of the cock. --Mortimer. [1913 Webster]
2. To become suddenly suffused, as the cheeks; to turn red; to blush. [1913 Webster]
3. To snow red; to shine suddenly; to glow. [1913 Webster]
In her cheek, distemper flushing glowed. --Milton. [1913 Webster]
4. To start up suddenly; to take wing as a bird. [1913 Webster]
Flushing from one spray unto another. --W. Browne. [1913 Webster]