Phrasal verbs consists of a basic verb + another word or words. The two or three words that make up a phrasal verb form a short 'phrase' - which is why we call them 'phrasal verbs'.
Phrasal Verb:
spill over
Meaning / Example:
1. [for a container] to overflow. > I hope your bucket of water doesn't spill over. > The milk glass spilled over because it was filled too full.
2. [for the contents of a container] to overflow. > The bucket is too full. I don't know why the water doesn't spill over.