| 单词 | to keep on a split yarn | 
| 释义 | > as lemmasto keep on a split yarn  c.    to keep on a split yarn and variants: to keep in a state of alert. Nautical slang. ΘΚΠ the world > action or operation > safety > protection or defence > vigilance > 			[verb (transitive)]		 > arouse to vigilance > keep in a state of vigilance to keep on a split yarn1929 1929    Papers Michigan Acad. Sci., Arts & Lett. 10 298/2  				Having everything on a split yarn, ready to start at once. 1958    W. King Stick & Stars 73  				All submariners had to be kept on a split yarn in case England was invaded. < as lemmas | 
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