| 1. | an instrument for measuring and recording time, esp. by mechanical means, usually with hands or changing numbers to indicate the hour and minute: not designed to be worn or carried about. |
| 2. | time clock. |
| 3. | a meter or other device, as a speedometer or taximeter, for measuring and recording speed, distance covered, or other quantitative functioning. |
| 4. | biological clock. |
| 5. | (initial capital letter ) Astronomy. the constellation Horologium. |
| 6. | Computers. the circuit in a digital computer that provides a common reference train of electronic pulses for all other circuits. |
| 7. | to time, test, or determine by means of a clock or watch: The racehorse was clocked at two minutes thirty seconds. |
| 8. | Slang. to strike sharply or heavily: Somebody clocked him on the face. |
| 9. | clock in, to begin work, esp. by punching a time clock: She clocked in at 9 on the dot. |
| 10. | clock out, to end work, esp. by punching a time clock: He clocked out early yesterday. |
| 11. | around the clock,
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| 12. | clean (someone's) clock, to defeat; vanquish. |
| 13. | kill the clock, Sports. to use up as much game time as possible when one is winning, as to protect a lead in basketball, ice hockey, or football. Also, run out the clock. |
| 14. | stop the clock, to postpone an official or legal deadline by ceasing to count the hours that elapse, as when a new union contract must be agreed upon before an old contract runs out. |

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