If something tickles you or tickles, it causes an irritating feeling by lightly touching a part of your body. a yellow hat with a great feather that tickled her ear A beard doesn't scratch, it just tickles
Wavering, or liable to waver and fall at the slightest touch; unstable; easily overthrown
the act of tickling a cutaneous sensation often resulting from light stroking touch or stroke lightly; "The grass tickled her calves" touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements