make it (your) business to (do something)

to decide you will take responsibility to do something.

He made it his business to find out what happened to the money.

• have the upper hand
• have the weight of the world on shoulders
• have the weight of the world on your shoulders
• have the whip hand
• have the world at feet
• have the world at your feet
• have time
• have time on hands
• have time on side
• have time on your hands
• have time on your side
• have to be seen to be believed
• have to eat words
• have to eat your words
• have to hand it to
• have to hand it to someone
• have to show for
• have to show for something
• have to spare
• have two pennies to rub together
• have up sleeve
• have up your sleeve
• have wicked way with
• have wicked way with someone
• Have will travel!