Definition of “smile”
noun:
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A facial expression comprised by flexing the muscles of both ends of one's mouth while showing the front teeth, without vocalisation, and in humans is a common involuntary or voluntary expression of happiness, pleasure, amusement or anxiety.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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verb:
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Or (intransitive) To have a smile on one's face.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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