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.
psych up Inf.
to get mentally ready for something.
I have to psych up before the big game tonight.
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.
A compilation of 50 phrasal verbs.