'Blush' definitions:

Definition of 'blush'

noun

A rosy color (especially in the cheeks) taken as a sign of good health [syn: bloom, blush, flush, rosiness]

noun

Sudden reddening of the face (as from embarrassment or guilt or shame or modesty) [syn: blush, flush]

verb

Turn red, as if in embarrassment or shame; "The girl blushed when a young man whistled as she walked by" [syn: blush, crimson, flush, redden]

verb

Become rosy or reddish; "her cheeks blushed in the cold winter air"

From: GCIDE

Blush \Blush\ (bl[u^]sh) v. i. [imp. & p. p. Blushed (bl[u^]sht); p. pr. & vb. n. Blushing.] [OE. bluschen to shine, look, turn red, AS. blyscan to glow; akin to blysa a torch, [=a]bl[=y]sian to blush, D. blozen, Dan. blusse to blaze, blush.] [1913 Webster]
1. To become suffused with red in the cheeks, as from a sense of shame, modesty, or confusion; to become red from such cause, as the cheeks or face. [1913 Webster]
To the nuptial bower I led her blushing like the morn. --Milton. [1913 Webster]
In the presence of the shameless and unblushing, the young offender is ashamed to blush. --Buckminster. [1913 Webster]
He would stroke The head of modest and ingenuous worth, That blushed at its own praise. --Cowper. [1913 Webster]
2. To grow red; to have a red or rosy color. [1913 Webster]
The sun of heaven, methought, was loth to set, But stayed, and made the western welkin blush. --Shak. [1913 Webster]
3. To have a warm and delicate color, as some roses and other flowers. [1913 Webster]
Full many a flower is born to blush unseen. --T. Gray. [1913 Webster]

From: GCIDE

From: GCIDE

Blush \Blush\, n.
1. A suffusion of the cheeks or face with red, as from a sense of shame, confusion, or modesty. [1913 Webster]
The rosy blush of love. --Trumbull. [1913 Webster]
2. A red or reddish color; a rosy tint. [1913 Webster]
Light's last blushes tinged the distant hills. --Lyttleton. [1913 Webster]
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. [1913 Webster]