A signal indicating that there is no danger or obstruction; esp. (a) a railway signal indicating that the line is clear (cf. danger, n. 4c); (b) a…
| 单词 | θ191862 |
| 释义 | society > communication > indication > signalling > [noun] > signal > danger-signal > all clear (1) all clear1853 A signal indicating that there is no danger or obstruction; esp. (a) a railway signal indicating that the line is clear (cf. danger, n. 4c); (b) a… |
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