Radical 口

9 strokes

mouth 口 (5) + join together 合 (347) = laugh 哈

哈哈 hāhā (sound of laughter)

At the mouth of the cave the potholers are joined together with ropes so nobody can get lost, when they hear a laugh booming round the cave. / They run in all directions, falling over the ropes, and the giant laughs even harder.