In this sentence the word gesticulation means

Gesticulation, in general, means to gesture with one's body for emphasis, like how one might make hand gestures or movements while they speak to help bring their point across or evoke an audience. Since you didn't post the sentence or context in which it was used, this is the best answer I can provide you with. Good luck though, have a lovely day!~ C;

C. his bad side hope this !