make it one's business
Definition of make it one's business
: to have as one's goal He's decided to make it his business to bring more affordable housing to the city.
Word by Word Definitions
: behave, act
: to begin or seem to begin (an action)
: to cause to happen to or be experienced by someone
: the manner or style in which a thing is constructed
: the physical, mental, or moral constitution of a person
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