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Jul 24, 2017 at 10:32 comment added English Student Thanks @threetimes for this very perceptive answer and for sharing your life experience. A pleasant smile is certainly expected when we meet people we know, or even those we don't! To clarify, I was asking about the type of person who may often smile in a friendly way, but speaks very little even when spoken to: "keeps his mouth zipped" might be the colloquial expression.
Jul 24, 2017 at 8:51 history answered threetimes CC BY-SA 3.0