New Year's Day
US /ˌnuː jɪrz ˈdeɪ/
UK /ˌnuː jɪrz ˈdeɪ/

1.
jour de l'An, Nouvel An
the first day of the year, January 1, observed as a holiday in many countries
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We always celebrate New Year's Day with a big family dinner.
Nous célébrons toujours le jour de l'An avec un grand dîner de famille.
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Many businesses are closed on New Year's Day.
De nombreuses entreprises sont fermées le jour de l'An.