Boil: v. tr. Cook in a boiling liquid.
Boil the pot: ensure the subsistence of the whole family.
To have enough to boil the pot: to have enough to live.
To boil with anger, impatience: to be carried away by anger, impatience.
Boil: get impatient, get carried away. Its slowness makes me boil: exasperates me.
It will boil! : there will be disorder, serious events.
To boil someone's milk: to make someone angry, to make them angry.