kocho-kocho
Tickling someone lightly with fingertips — the classic tickling word, often said aloud while tickling.
💡Playing with a baby — 'Kocho-kocho!' as you tickle their tummy.
赤ちゃんの足の裏をこちょこちょとくすぐった。
I tickled the baby's foot kocho-kocho.
She tickled her little brother ___ until he laughed.
赤ちゃんの足の裏を○○とくすぐった。