tic
//tɪk//
Noun
ticSingular
ticsPlural
1
A habitual spasmodic contraction of the muscles, most often in the face, that is involuntary and repetitive.
He developed a nervous tic in his eye when he was stressed.
2
An idiosyncratic and habitual feature of a person's behavior or manner of speaking.
One of his verbal tics is saying "you know" at the end of every sentence.