Meaning

noun a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement

verb change one's facial expression by spreading the lips, often to signal pleasure

verb express with a smile

originFrom 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…

Etymology from Wiktionary, CC BY-SA 3.0