blush
noun.
a rosy color (especially in the cheeks) taken as a sign of good health
Synonym: bloom, flush, rosiness
noun.
sudden reddening of the face (as from embarrassment or guilt or shame or modesty)
Synonym: flush
verb.
turn red, as if in embarrassment or shame
The girl blushed when a young man whistled as she walked by
Synonym: crimson, flush, redden
verb.
become rosy or reddish
her cheeks blushed in the cold winter air