blush

blush (http://definr.com/blush)

     n 1: a rosy color (especially in the cheeks) taken as a sign of
          good health [syn: bloom, flush, rosiness]
     2: sudden reddening of the face (as from embarrassment or guilt
        or shame or modesty) [syn: flush]
     v 1: turn red, as if in embarrassment or shame; "The girl blushed
          when a young man whistled as she walked by" [syn: crimson,
           flush, redden]
     2: become rosy or reddish; "her cheeks blushed in the cold
        winter air"