/grɪn; ˇrɪn/
v (-nn-)
1 [I, Ipr] ~ (at sb) smile broadly, so as to show the teeth, expressing amusement, foolish satisfaction, contempt, etc 露齿而笑（表示高兴、愚蠢的满足、轻蔑等）; 咧着嘴笑; 龇着牙笑
*He grinned at me, as if sharing a secret joke. 他朝我龇牙一笑, 好像彼此会心领略一个笑话.
* grin with delight 高兴得露齿一笑
* grin from ear to ear, ie very broadly 咧着大嘴笑.
2 [Tn] express (sth) by grinning 露齿笑着表示（某事）
*He grinned his approval. 他咧嘴一笑表示赞成.
3 (idm 习语) grin and `bear it endure pain, disappointment, etc without complaining 毫无怨言地忍受痛苦、挫折等.

n act of grinning 露齿笑
*a broad, foolish, silly, etc grin 咧着嘴的、愚蠢的、傻气的...一笑
* With a nasty grin on his face he took out a knife. 他狞笑着掏出了刀子.