Grammar fix
boil over
liquid spills while boiling
rise up and spill over the side of a pan while boiling
phrasal verbB1common
Hear it in context
Notice where the phrase sounds natural.
Keep an eye on the pasta or it'll boil over and make a mess.
The milk boiled over and went all over the hob.
Fix the pattern
One small grammar move makes it sound right.
Confusing with 'boil' alone — 'boil over' means it spills.