at first blush, without previous knowledge or adequate consideration; at first glance: At first blush, the solution to the problem seemed simple enough.
Origin: 1275–1325; (v.) Middle Englishbluschen,Old Englishblyscan to redden; akin to Old Englishblysa,Old Norseblys,Middle Low Germanblus torch, bloschen to blaze; (noun) Middle Englishblusch, blisch, derivative of the v.
M.E. bluschen, from O.E. blyscan "blush, become red, glow" (glossing L. rutilare), akin to blyse "torch," from P.Gmc. *blusi, which also yielded words in Low Ger. (cf. Du. blozen "to blush") and O.N.; from PIE *bhles- "shine" (see blaze). For vowel evolution, see bury.