a local and habitual twitching especially in the face
"After staying up all night, I couldn't stop my eye from doing that annoying tic every time someone spoke to me."
A sudden, nonrhythmic motor movement or vocalization.
"Don't forget to stop at TIC before you head out to explore the ancient ruins."
Initialism of tourist information centre.
To exhibit a tic; to undergo a sudden, semi-voluntary muscle movement.
"After staring at his computer screen for hours, he couldn't help but give himself a nervous eye tic every time someone walked into the room."