vi.露齿而笑
vt.露齿笑着表示
n.咧嘴笑,露齿而笑
Bobby looked at her with a sheepish grin.
博比望着她腼腆地咧嘴一笑。
He had a grin on his face like a Cheshire Cat.
他咧着嘴笑呵呵的。
All at once, Mick's serious expression softened into a grin.
米克严肃的表情一下子变成了笑脸。