Linda from Wichita, Kansas, thinks we need a word for that closed-mouth little smile we give to strangers on the street — not a friendly Duchenne smile, just a polite acknowledgment of the other person’s existence. She suggests the word smurm...
Duchenne smile n.— «He knows the difference between Duchenne and non-Duchenne smiles: one crinkles the orbicularis oculi muscles and the other does not. One is genuine and shows in the eyes; the other mostly involves the mouth and looks...