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:
bat something around
Meaning / Example:
1. to knock something around with a bat or something similar. > Let's bat around some balls before we go home.
2. to discuss something back and forth. > Let's bat this around a little bit tomorrow at our meeting.