From Longman Dictionary of Contemporary Englishmake it your business to do somethingmake it your business to do somethingTRY TO DO OR GET somethingto make a special effort to do something Ruth made it her business to get to know the customers. → business
Examples from the Corpus
make it your business to do something• Increasingly, companies are making it their business to develop programs for serving both the worker and the bottom line.• Quinn knew this because he had made it his business to know such things.• I made it my business to be there at dinner the following day.• I make it my business to acquaint myself with where objects properly belong in a house.• Ruth made it her business to get to know the customers.• She made it her business to find out.• They made it their business to worm a curl of something out of you.• These villagers - of course they would make it their business to know anyone who was rich and whose father lived so near!• But before you leave I suggest that you make it your business to find out. 