Phrasal verbs are compound verbs that result from combining a verb with an adverb or a preposition. The resulting compound verb is idiomatic.
Phrasal Verb:
rear up
Meaning / Example:
1. [for a horse] to lean back on its hind legs and raise its front legs, assuming a threatening posture or avoiding something on the ground such as a snake. > When the horse reared up, I almost fell off.
2. [for something, especially a problem] to raise up suddenly. > A new problem reared up and cost us a lot of time.
A phrase that combines a verb with a preposition or adverb or both and that functions as a verb whose meaning is different from the combined meanings of the individual words.