tick

Short definition from Wiktionary

Noun

1. 1
   A tiny woodland arachnid of the suborder Ixodida.
2. 2
   A relatively quiet but sharp sound generally made repeatedly by moving machinery.
3. 3
   A mark on any scale of measurement; a unit of measurement.
4. 4
   A jiffy (unit of time defined by basic timer frequency).
5. 5
   A short period of time, particularly a second.
6. 6
   A periodic increment of damage or healing caused by an ongoing status effect.
7. 7
   Each of the fixed time periods, in a tick-based game, in which players or characters may perform a set number of actions.
8. 8
   A mark (✓) made to indicate agreement, correctness or acknowledgement.
9. 9
   A bird seen (or heard) by a birdwatcher, for the first time that day, year, trip, etc., and thus added to a list of observed birds.
10. 10
    A whinchat (Saxicola rubetra).
11. 11
    A tap or light touch.
12. 12
    A slight speck.
13. 13
    Ticking.
14. 14
    A sheet that wraps around a mattress; the cover of a mattress, containing the filling.
15. 15
    Credit, trust.
16. 16
    A goat.

Verb

1. 1
   To make a clicking noise similar to the movement of the hands of an analog clock.
2. 2
   To make a tick or checkmark.
3. 3
   To work or operate, especially mechanically.
4. 4
   To strike gently; to pat.
5. 5
   To add (a bird) to a list of birds that have been seen (or heard).
6. 6
   To go on trust, or credit.
7. 7
   To give tick; to trust.