grin from ear to ear

US /ɡrɪn frəm ɪr tu ɪr/
UK /ɡrɪn frəm ɪr tu ɪr/
"grin from ear to ear" picture
1.

咧嘴大笑, 笑得合不攏嘴

to smile broadly, showing great pleasure or amusement

:
When she saw the surprise party, she started to grin from ear to ear.
當她看到驚喜派對時,她開始咧嘴大笑
He was grinning from ear to ear after winning the lottery.
中彩票後,他咧嘴大笑