Phrasal verbs, also called two-word verbs, are idiomatic expressions wherein the second element of the verb (the adverb or particle) is not necessarily predictable.
Phrasal Verb:
fire something up
Meaning / Example:
1. to light something, such as a pipe, cigarette, etc. > If you fire that pipe up, I will leave the room.
2. to start something such as an engine. > Fire this thing up, and let's get going.