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

originTwo main origins: * Scottish patronymic surname from Small. * English topographic surname for someone who lived near a rabbit warren, from the plural of Old English smygel (“burrow”).

Etymology from Wiktionary, CC BY-SA 3.0