Welk \\Welk\\, v. i. [imp. & p. p. {Welked}; p. pr. & vb. n. Welk Welking.] [OE. welken; cf. D. & G. welken to wither, G. welk withered, OHG. welc moist. See Welkin, and cf. Wilt.] To wither; to fade; also, to decay; to decline; to wane. [Obs.]

When ruddy Ph?bus 'gins to welk in west. --Spenser.

The church, that before by insensible degrees welked and impaired, now with large steps went down hill decaying. --Milton.