Couch potato: meaning, tone, and use in English
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Use couch potato for an informal comment about someone who spends a lot of free time sitting and watching entertainment: 'I was a couch potato all weekend.' Be careful when you say it about another person. A direct sentence such as 'He spent the evening watching television' is kinder and more exact.
After finishing her exams, Mei called herself a couch potato because she watched films on the sofa all weekend.