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sit-up (n.)
[sit-up 词源字典]
also
situp
, kind of physical exercise, 1955, from the verbal phrase (attested from early 13c.); see
sit
(v.) +
up
(adv.). Related:
Sit-ups
.
[sit-up etymology, sit-up origin, 英语词源]
[sit-up 词源字典]