[交流] Funny English quiz in everyday（NO.20）

Previously
Q: What is that which you have never seen, heard or felt, which never existed and still has a name?

A: Nothing.

Today’s Question
What can you swallow that can also swallow you?

We will hold this column everyday, the one who write the right answer first can earned 1 BB.
If u missed it this time, please come on and come here early, then use your smart head to find the answer.
I will give u the right answer in the column tomorrow.
So good luck to u!