B1
If a container of liquid boils, or if you boil it, it reaches the temperature where bubbles rise up in it and it produces steam.
Dictionary examples:
My roommate boiled his socks in the soup pot. Yum! (0.0)
I boiled water for instant noodles, but ate the noodles dry! (0.0)
I boiled water for tea, but forgot to add the tea! (0.0)
The pot's boiling. (23.3)