couch potato
US /ˈkaʊtʃ pəˌteɪ.toʊ/
UK /ˈkaʊtʃ pəˌteɪ.toʊ/
1.
a person who spends a lot of time sitting or lying down, watching television, playing video games, etc., and not doing anything active
:
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After a long week, all he wanted to do was be a couch potato.
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My brother is such a couch potato; he never leaves the house on weekends.