Definition of "Blush" :

noun: sudden reddening of the face (as from embarrassment or guilt or shame or modesty)

noun: a rosy color (especially in the cheeks) taken as a sign of good health

verb: turn red, as if in embarrassment or shame

"The girl blushed when a young man whistled as she walked by."

verb: become rosy or reddish

"Her cheeks blushed in the cold winter air."