redden
/ˈredən/verb
1- make or become red（使）变红, 染红：
with obj. bare arms reddened by sun and wind风吹日晒后变红的赤裸胳膊
no obj. the sky is reddening.红霞漫天。
1.1
- no obj.(of a person) blush（人）脸红, 害羞：
Lyn reddened at the description of herself.
听到人家这样讲她, 琳脸红了。
1.2
- no obj.(of the eyes) become pink at the rims as a result of crying（眼睛）哭红。