Rarely tic. [ad. F. tic in same senses: cf. TIC (which retains the Fr. spelling).]

1

  1.  The vice or morbid habit in horses called cribbiting or cribbing, Cf. TICK v.3

2

1720.  W. Gibson, Diet. Horses, v. (1731), 83. There is another Vice which some Horses are addicted to … called the Tick.

3

  2.  A whim, a fancy; a peculiar habit or notion, an idiosyncrasy.

4

[1896.  Daily News, 30 Sept., 6/3. It is mere ‘tic or habit.]

5

1900.  Sarah Grand, Babs, ix. She’s got some tick in her head about being firm with me.

6