チートデイ
also: チートデー
チ
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Meanings
1
cheat day
A day during a diet or fitness regimen when one intentionally eats freely, often high-calorie or restricted foods, as a psychological break or metabolic reset.
I'm on a diet, but today is a cheat day, so I'll eat whatever I like.
I look forward to my once-a-week cheat day.