mask (v.)youdaoicibaDictYouDict[mask 词源字典]
1560s, "take part in a masquerade;" 1570s, "to disguise;" 1580s, "to wear a mask," from mask (n.). Figurative use by 1580s. Extended sense of "to disguise" is attested from 1847. Related: Masked; masking. Masking tape recorded from 1927; so called because it is used to block out certain surfaces before painting.[mask etymology, mask origin, 英语词源]