Other forms: smiling, smiles, smiled
To smile is to turn the corners of your mouth up because you feel good. Smile at her, a broad smile, give us a smile.
A genuine smile involves the muscles round the eyes as well as the mouth, and one without them is recognised as false by almost everybody without being able to say why — it is called a Duchenne smile after the physiologist who noticed. Smiling is contagious. Note smile at somebody, which is warm, and smile about something; and that in some cultures smiling at strangers is friendly and in others it is odd.
1verbsmileTo turn the corners of your mouth up because you feel good.
“The baby smiled when she saw her mother.”
2nounexpressionThe expression itself.
“She has a lovely smile that makes everyone feel welcome.”
Too few real examples of this word to estimate which sense is commonest.
smile is an expression of pleasure.
Middle English smilen came from Germanic and is related to a Proto-Indo-European root meaning to laugh or wonder — the same root behind marvel and mirror at a great distance.
Proto-Indo-European
*(s)mey-
Proto-Indo-European
*smey- — to laugh, be glad, wonder
Proto-Germanic
*smilāną — to smile
Proto-West Germanic
*smilēn
Old High German
smielēn
Middle High German
smielen
Middle Low German
*smîlen — to smile
Middle English
smilen — to smile
English, today
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 smilēn, from Proto-Germanic smilāną (“to smile”), from Proto-Indo-European smey- (“to laugh, be glad, wonder”). Cognate with Danish smile, Swedish smila, Faroese smíla (“to smile”); also stq 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”).
Etymology from Wiktionary, CC BY-SA