To shake, quiver, or vibrate.
To fear; to be afraid.
A shake, quiver, or vibration.
To twitch or move convulsively.
To touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements.
To tickle, provoking twitching and laughter.
To criticize in a somewhat irritating way; to carp at.