What is "at the first blush"

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.