Rarely tic. [ad. F. tic in same senses: cf. TIC (which retains the Fr. spelling).]
1. The vice or morbid habit in horses called cribbiting or cribbing, Cf. TICK v.3
1720. W. Gibson, Diet. Horses, v. (1731), 83. There is another Vice which some Horses are addicted to called the Tick.
2. A whim, a fancy; a peculiar habit or notion, an idiosyncrasy.
[1896. Daily News, 30 Sept., 6/3. It is mere tic or habit.]
1900. Sarah Grand, Babs, ix. Shes got some tick in her head about being firm with me.