1. make or become red: "bare arms reddened by sun and wind"Similarmake/colour redrare:mantle
▪ (of a person) blush: "Lyn reddened at the description of herself"Similargo/turn redgo/turn pink/crimson/scarletblushflushcolourcolour upcrimsonburnrare:mantle
▪ (of the eyes) become pink at the rims as a result of crying:"the reddened eyes filled afresh"