make it one's business

make it one's business

Undertake a self-appointed task, as in I'll make it my business to find out their plans. This phrase was first recorded in 1642.
See also: business, make
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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