laugh – смеяться; смех

laugh (v.) (из староанглийского «hlæhhan», ранее – «hlihhan»); из протогерманского *klakhjan; из PIE *kleg-, звукоподражательное
late 14c., from Old English (Anglian) hlæhhan, earlier hlihhan, from Proto-Germanic *klakhjan (cognates: Old Norse hlæja, Danish le, Old Frisian hlakkia, Old Saxon hlahhian, Middle Dutch and Dutch lachen, Old High German hlahhan, German lachen, Gothic hlahjan), from PIE *kleg-, of imitative origin (compare Latin cachinnare "to laugh aloud," Sanskrit kakhati "laughs," Old Church Slavonic chochotati "laugh," Lithuanian klageti "to cackle," Greek kakhazein). Originally with a "hard" -gh- sound, as in Scottish loch; the spelling remained after the pronunciation shifted to "-f."

Т.е. это «хи, хи, ха, ха, хохотать, хохочу», так же «квохтать, квохчу», «клекот, клекочу»