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:
run off
Meaning / Example:
1. to flee. > The children rang our doorbell and then ran off. > They ran off as fast as they could.
2. to have diarrhea. > He said he was running off all night. > One of the children was running off and had to stay home from school.
3. [for a fluid] to drain away from a flat area. > By noon, all the rainwater had run off the playground.