A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a "Duchenne smile". Smiles performed without the eye contraction can be perceived as "fake".
近义、反义、联想词
近义词
n.
facial expression, facial gesture
v.
grimace, make a face, pull a face, express, show, evince