fast food restaurant
US /ˌfæst fuːd ˈres.tə.rɑːnt/
UK /ˌfæst fuːd ˈres.tə.rɑːnt/

1.
a restaurant where food is prepared and served quickly, often for consumption off the premises
:
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Let's grab a quick bite at the fast food restaurant.
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Many people prefer to eat at a fast food restaurant due to convenience.