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When you don't get the whole thing. Like you got part of something, but then you lost part of it. Now you're stuck with half the old thing, but the whole new thing happened. Like I tripped and cracked my face. Now I have half my balance!
I ate half my burger, then the dog ate the rest. Now I have half my hunger, but the whole dog problem.
I got half the money, but then I lost half of that. Now I have half of half. Which is, like, not even a real amount.
I got half the job, but then I got fired. Now I have half my job, but the whole disaster.