/ blɑːntʃ; NAmE blæntʃ/ verb
1.
[ v ] blanch (at sth) ( formal ) to become pale because you are shocked or frightened
2.
[ vn ] to prepare food, especially vegetables, by putting it into boiling water for a short time
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WORD ORIGIN
Middle English : from Old French blanchir , from blanc white, ultimately of Germanic origin.