Source : Webster's Revised Unabridged Dictionary (1913)

Blush \Blush\, n.
   1. A suffusion of the cheeks or face with red, as from a
      sense of shame, confusion, or modesty.

            The rosy blush of love.               --Trumbull.

   2. A red or reddish color; a rosy tint.

            Light's last blushes tinged the distant hills.
                                                  --Lyttleton.

   {At first blush}, or {At the first blush}, at the first
      appearance or view. ``At the first blush, we thought they
      had been ships come from France.'' --Hakluyt.

   Note: This phrase is used now more of ideas, opinions, etc.,
         than of material things. ``All purely identical
         propositions, obviously, and at first blush, appear,''
         etc. --Locke.

   {To put to the blush}, to cause to blush with shame; to put
      to shame.