Redden (verb)

1. To become red, especially in the face.
2. To cause to become red.

Origin:

From old english rēad + -en.

Examples:

1. He reddened at the thought of his mistake.
2. The sun reddened the sky at sunset.
3. The embarrassment reddened her cheeks.
4. The cold air reddened her nose.
5. The hard work reddened his palms.