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vellicate▼(touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements)
verb
[UK: vˈelɪkˌeɪt] [US: vˈelᵻkˌeɪt]

twitch [twitched, twitching, twitches]▼(to perform a twitch; spasm)
verb
[UK: twɪtʃ] [US: ˈtwɪtʃ]