vi.

1. 露齿而笑[（+at/with）]
   She grinned foolishly at him.

   她咧着嘴对他傻笑。

2. （因痛苦，愤恨等）龇牙咧嘴

vt.

1. 露齿笑着表示
   She grinned her appreciation of my help.

   她露齿一笑表示感激我的帮助。

n.

1. 露齿的笑；龇牙咧嘴[C]
   He had a broad grin on his face.

   他满脸笑容。

v.

1. smile broadly.
2. grimace grotesquely in a way that reveals the teeth.

n.