fall down 倒下
pass out 晕倒
collapse 倒下
1. He suddenly keeled over from the heat.
他因为酷热突然晕倒了。
2. The old horse keeled over in the middle of the field.
那匹老马在田野中间突然倒下了。
3. If you don't rest, you might keel over.
如果你不休息，你可能会累倒。
A: Did you see him? He just keeled over!
A：你看到他了吗？他突然晕倒了！
B: Yes, we are calling an ambulance right now.
B：看到了，我们正在叫救护车。
1) 晕倒
2) 倒下
3) 猝死
1. 突然倒下或死亡
e.g. He keeled over in the street.
他在街上突然晕倒了
phrasal verb
1. to fall over or to die suddenly, often due to illness or exhaustion