"All yours"

[W Brewer]

It's all yours:  I transfer responsibility for this burden to you ~ This
wonderful, large gift is for you.
He/she's all yours: You can use this helper now ~ This guy is your problem
now.
I'm all yours:  You may utilize my time/effort for your benefit ~ I'm ready
to go steady, Betty/Freddy.

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The American Dialect Society - http://www.americandialect.org