Definition of smile noun from the Oxford Advanced Learner's Dictionary

  

smile

 noun
noun
BrE BrE//smaɪl//
 
; NAmE NAmE//smaɪl//
 
Happiness
 
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  •  the expression that you have on your face when you are happy, amused, etc. in which the corners of your mouth turn upwards ‘Oh, hello,’ he said, with a smile. She gave a wry smile. He had a big smile on his face. I'm going to wipe that smile off your face (= make you stop thinking this is funny). See related entries: Happiness
  • Word Origin Middle English: perhaps of Scandinavian origin; related to smirk.Extra examples A faint smile flickered across her face. A gentle smile spread over her face. A small smile played on his lips. A smile came to her lips. A trace of a smile played across her lips. A wry smile crept over his face. A wry smile tugged at the corner of his mouth. He could hardly keep the smile off his face. He flashed her a disarming smile. He had a goofy smile plastered across his face. He had an infectious smile that touched the lives of many people. Her antics brought a smile to my face. Her father forced a smile. Her smile grew radiant. Her sunny smile vanished as she read the letter. His face creased into a smile. His face was wreathed in smiles. His smile faltered slightly. I’m going to wipe that smile off your face. It is a beautiful song that puts a smile on your face. Mention of this subject is guaranteed to raise a smile. She always has a smile on her face. She gave a wry smile. She got up immediately, a smile lighting up her face. She had a keen wit and a ready smile. She has a beautiful smile. She managed a weak smile. She returned his smile. She suppressed a mirthless smile. The little boy had a smile plastered across his face. They had to hide their smiles. a grim smile of satisfaction the warm smile in his eyesIdioms  looking very happy, especially soon after you have been looking worried or sad Twelve hours later she was all smiles again.
    See the Oxford Advanced American Dictionary entry: smile