

弟の足をくすぐったら、大声で笑い出した。
お願いだから、くすぐらないで!
赤ちゃんのおなかをくすぐると、うれしそうに笑います。
"くすぐる" is in the lesson "Emotions" (Level 19), along with 10 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.