done like a dinner
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done like (a) dinner
Having failed or lost. Primarily heard in Australia. Your team will be done like dinner if they play against the all-star team. I just finished my paper, but class starts in five minutes, and the printer isn't working, so I'm done like a dinner.
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done like a dinnerAUSTRALIAN
If you are done like a dinner in a competitive situation, your opponents defeat you completely, often in an unfair way. These laws mean that foreign competitors get done like a dinner.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012