Phrasal verbs are two or more words that together act as a completely new verb with a meaning separate from those of the original words.
Phrasal Verb:
chalk something out
Meaning / Example:
1. to draw a picture of something in chalk, especially to illustrate a plan of some type. > The coach chalked the play out so the players could understand what they were to do.
2. to explain something carefully to someone, as if one were talking about a chalk drawing.