redden

verb (used with object)

1. to make or cause to become red.

verb (used without object)

2. to become red.
3. to blush; flush.

verb

1. to make or become red
2. (intr) to flush with embarrassment, anger, etc; blush

v.

“become red; make red,” late 14c., from red (adj.1) + -en (1). Old English had readian, reodian “become red.” Related: Reddened; reddening.