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Phrase(s): chalk something out
1. Lit. 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. • Our team captain chalked out the play. 2. Fig. to explain something carefully to someone, as if one were talking about a chalk drawing. • She chalked out the details of the plan over the phone.
McGrawhill's American Idioms And Phrasal Verbs