o'clock
adj.
c.1720, abbreviation of of the clock (1640s), from Middle English of the clokke (late 14c.). Use of clock hand positions to describe vector directions or angles is from late 18c.
| 词汇 | o'clock |
| 词根词缀 | Online Etymology Dictionary o'clock adj. c.1720, abbreviation of of the clock (1640s), from Middle English of the clokke (late 14c.). Use of clock hand positions to describe vector directions or angles is from late 18c. |
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