noun
a light and playful touch or stroke that causes someone to laugh or squirm
verb
to touch or stroke lightly in a way that causes laughter or twitching movements
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The child couldn't stop giggling as his mother gently tickled his feet.
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I dare you to tickle Sarah when she least expects it!
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Let's tickle the ivories and play some tunes on the piano.
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The idea of skydiving tickles my adventurous spirit.