Meaning

verb turn pale, as if in fear

verb cook (vegetables) briefly

originFrom Middle English blaunchen, from Old French blanchir, from Old French blanc (“white”), from Early Medieval Latin blancus, from Frankish *blank, from Proto-Germanic *blankaz (“bright, shining, blinding, white”), from Proto-Indo-European *bʰleyǵ- (“to shine”). Cognates Cognate with blench (“to deceive, to trick”) through Proto-Indo-European, whence other etymology of blanch.

Etymology from Wiktionary, CC BY-SA 3.0