ピクピク

adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'

twitching; spasming

Describes small, repeated muscle twitches or spasms, often involuntary. Used adverbially with と or as a する verb.

• まぶたがピクピクする。

  My eyelid is twitching.

• 疲つかれると、足あしの筋きん肉にくがピクピクとけいれんする。

  When I'm tired, the muscles in my legs twitch and cramp.