1. A sudden and brief redness of the face and neck due to emotion. 2. In angiography, used metaphorically to describe neovascularity or, in some cases, extravasation. [M.E., fr. O.E. blyscan,]
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blush 'bləsh vi to become red in the face esp. from shame, modesty, or confusion
blush n
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(blush) sudden, brief erythema of the face and neck, resulting from vascular dilatation due to emotion or heat.Medical dictionary. 2011.