| 单词 | to be on the ball | 
| 释义 | > as lemmasto be on the ball  o.   colloquial (originally U.S.).  to be on the ball: to be accurate or apt; to be alert. ΘΚΠ the mind > attention and judgement > attention > notice, observation > listen attentively			[phrase]		 > be alert to have one's wits about one1622 to be all there1864 he (or she) never misses (does not miss, etc.) a trick1922 to have (also keep) one's eye on the ball1937 to be on the ball1939 1939    W. C. Williams Let. 7 June in  W. C. Williams  & J. Laughlin Sel. Lett. 		(1989)	 48  				The novella by Quevedo..[is] right on the ball. 1961    Listener 28 Dec. 1136/2  				The B.B.C. are ‘on the ball’ as the Americans would say. 2005    S. Booth One Last Breath iv. 41  				She was sharp, on the ball, a cut above the rest of them in CID. < as lemmas | 
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