on one's hands
on one's hands {adv.} or {adj. phr.}
In your care or responsibility; that you must do something about.
Mrs. Blake left her five children with me while she shopped. I could not get anything done with the children on my hands.
After everyone bought tickets to the dance, the club treasurer had over $100 on his hands.
The electricity went off while Mother was cooking supper, and she had a problem on her hands.
I had time on my hands before the bus came, so I bought a newspaper to read.
Contrast: OFF ONE'S HANDS.
See: SIT ON ONE'S HANDS.
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Source: A Dictionary of American Idioms