noun
a day on which a person allows themselves to eat foods that are not typically allowed on a diet
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I allow myself a cheat day once a week to indulge in my favorite foods.
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I'm looking forward to my cheat day on Saturday so I can eat pizza and ice cream.
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I'm gonna go all out on my cheat day and have a burger and fries.
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For me, a cheat day is like a mental break from my strict diet routine.