checkpoint
n.
1940, from check, v. + point, n.. Originally an aviator's term for landforms or structures of known height against which the craft's altitude could be visually checked. The "vehicle stop" sense is recorded from 1950.
| 词汇 | checkpoint |
| 词根词缀 | Online Etymology Dictionary checkpoint n. 1940, from check, v. + point, n.. Originally an aviator's term for landforms or structures of known height against which the craft's altitude could be visually checked. The "vehicle stop" sense is recorded from 1950. |
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