| 1. | a slight, sharp, recurring click, tap, or beat, as of a clock. |
| 2. | Chiefly British Informal. a moment or instant. |
| 3. | a small dot, mark, check, or electronic signal, as used to mark off an item on a list, serve as a reminder, or call attention to something. |
| 4. | Stock Exchange.
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| 5. | Manège. a jumping fault consisting of a light touch of a fence with one or more feet. |
| 6. | a small contrasting spot of color on the coat of a mammal or the feathers of a bird. |
| 7. | to emit or produce a tick, like that of a clock. |
| 8. | to pass as with ticks of a clock: The hours ticked by. |
| 9. | to sound or announce by a tick or ticks: The clock ticked the minutes. |
| 10. | to mark with a tick or ticks; check (usually fol. by off); to tick off the items on the memo. |
| 11. | tick off, Slang.
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| 12. | what makes one tick, the motive or explanation of one's behavior: The biographer failed to show what made Herbert Hoover tick. |

,| 1. | any of numerous bloodsucking arachnids of the order Acarina, including the families Ixodidae and Argasidae, somewhat larger than the related mites and having a barbed proboscis for attachment to the skin of warm-blooded vertebrates: some ticks are vectors of disease. |
| 2. | sheeptick. |

tick
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TICK
tick 2 (tĭk)
n.
Any of numerous small bloodsucking parasitic arachnids of the families Ixodidae and Argasidae, many of which transmit febrile diseases, such as Rocky Mountain spotted fever and Lyme disease.
Any of various usually wingless, louselike insects of the family Hippobosciddae that are parasitic on sheep, goats, and other animals.