1. to become red or make something red
2. to become embarrassed and have one’s face turn red

Examples

• Her cheeks reddened in the cold wind.
• The sunset reddened the sky beautifully.
• He reddened with embarrassment when she complimented him.
• The leaves redden in autumn.
• Her face reddened when she realized her mistake.
• The iron began to redden in the fire.
• She reddened at the unexpected praise.