Etymology
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redden (v.)

1610s, "make read;" 1640s, "become red" (especially of the face, with shame, etc.), from red (adj.1) + -en (1). The older verb form is Middle English reden, Old English readian, reodian "become red;" see red (v.). Related: Reddened; reddening.

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Definitions of redden

redden (v.)
turn red, as if in embarrassment or shame;
Synonyms: blush / crimson / flush
redden (v.)
make red;
The setting sun reddened the sky
redden (v.)
turn red or redder;
The sky reddened
From wordnet.princeton.edu