off-and-on
adv.
"intermittently," 1530s; see off, adv. + on. As an adjective from 1580s.
词汇 | off-and-on |
词根词缀 | Online Etymology Dictionary off-and-on adv. "intermittently," 1530s; see off, adv. + on. As an adjective from 1580s. |
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