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do-it-yourself
[do-it-yourself 词源字典]
as a modifier, attested by 1941. The expression is much older.
[do-it-yourself etymology, do-it-yourself origin, 英语词源]
yourself
by early 14c., from
your
+
self
. Plural
yourselves
first recorded 1520s.
[do-it-yourself 词源字典]