If you grin and bear it, you accept a difficult or unpleasant situation without complaining because you know there is nothing you can do to make things better. They cannot stand the sight of each other, but they will just have to grin and bear it. a wide smile
A grin is a broad smile. She came out of his office with a big grin on her face Bobby looked at her with a sheepish grin
To set the teeth together and open the lips, or to open the mouth and withdraw the lips from the teeth, so as to show them, as in laughter, scorn, or pain
When you grin, you smile broadly. He grins, delighted at the memory Sarah tried several times to catch Philip's eye, but he just grinned at her. a statue of a grinning old man cutting the throat of a deer
Abbreviation for gradient index Generally refers to the SELFOC lens often used in fiber optics
The act of closing the teeth and showing them, or of withdrawing the lips and showing the teeth; a hard, forced, or sneering smile