pop off
1．go away hurriedly赶紧离开
I must pop off now．我得走了。
Where has he popped off to？他匆忙去哪里了？
2．die死
I'm not going to pop off just now，so you needn't worry．我还不会死，你不用着急。
He popped off at the age of twenty．他在20岁时突然死去。
3．fire放（枪、炮等）
The children were running about popping off their toy guns．孩子们奔跑着，劈哩啪啦地放玩具枪。