/klɒk ||; klɑk/noun[C] 1 an instrument that shows you what time it is 时钟: an alarm clock 闹钟a church clock 教堂的钟 ☞Look at watch. 参看watch。
2 an instrument in a car that measures how far it has travelled （汽车的）里程计，里程表: My car has only got 10000 miles on the clock. 我汽车上的里程表显示只走了10000英里。
against the clock if you do sth against the clock, you do it fast in order to finish before a certain time （为如期完成任务）争分夺秒:
It was a race against the clock to get the building work finished on time. 为了让大楼工程如期完成而与时间赛跑。 around/round the clock all day and all night 日夜不停；夜以继日:
They are working round the clock to repair the bridge. 他们正日夜抢修这座桥梁。 put the clock/clocks forward/back to change the time, usually by one hour, at the beginning/end of summer （在夏季开始或结束的时候）把钟拨快或拨慢（通常为一小时）