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Phrase(s): slough something off
1. Lit. to brush or rub something off. • The snake sloughed its old skin off. • It sloughed off its skin. 2. Fig. to ignore or disregard a negative remark or incident. • I could see that the remark had hurt her feelings, but she just pretended to slough it off. • Liz sloughed off the remark.
McGrawhill's American Idioms And Phrasal Verbs