blush in WordNet English dictionary

1. a rosy color (especially in the cheeks) taken as a sign of good health
   bloom  blush  flush  rosiness 
   
2. sudden reddening of the face (as from embarrassment or guilt or shame or modesty)
   blush  flush 
   

1. turn red, as if in embarrassment or shame
   "The girl blushed when a young man whistled as she walked by"
   blush  crimson  flush  redden 
   
2. become rosy or reddish
   "her cheeks blushed in the cold winter air"
   blush