| 单词 | signal arm |
| 释义 | > as lemmassignal arm signal arm n. a pivoted projection on a semaphore, which may be raised and lowered for the purpose of signalling on a railway or at a level crossing. ΚΠ 1851 Morning Post 31 May 5/2 Robson is not to approach me until the signal arm is lowered. 1901 Railway Mag. May 463/2 A neighbouring signal-arm falls. 1994 San Jose (Calif.) Mercury (Nexis) 12 Nov. 1 b The warning lights were flashing at the crossing but the signal arms were found still in an upright position. < as lemmas |
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