smile

From Middle English smilen (“to smile”), from Middle Low German *smîlen (“to smile”), from Middle High German smielen, from Old High German smielēn, from Proto-West Germanic *smīlēn, from Proto-Germanic *smīlāną (“to smile”), from Proto-Indo-European *smey- (“to laugh, be glad, wonder”).

Cognate with Danish smile, Swedish smila, Faroese smíla (“to smile”); also Saterland Frisian smielje (“to smile”), Low German smielen (“to smile”), Dutch smuilen (“to smile”), Middle High German smielen (“to smile”). Related also to Old High German smierōn (“to smile”), Old English smerian (“to laugh at”), Old English smercian, smearcian ("to smile"; > English smirk), Latin mīror (“to wonder at”).