仕し事ごと始はじめ

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Meanings

resuming work after the New Year's vacation; first work of the year

Refers to the first day back at work after the New Year holiday, or the first time one works in the new year. Often used in business contexts.

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Today was the first day back at work after the New Year's vacation, and I went to the office for the first time in a while.

仕し事ごと始はじめの日ひは、みんなで新しん年ねんの挨あい拶さつを交かわす。

On the first workday of the year, everyone exchanges New Year's greetings.

仕し事ごと始はじめを迎むかえるto reach the first business day of the new year
多おおくの会かい社しゃは1月がつ4日よっかに仕し事ごと始はじめを迎むかえる。
Many companies have their first business day of the year on January 4th.
仕し事ごと始はじめに〈事こと〉をするto do something on the first day back at work
仕し事ごと始はじめに社しゃ員いん全ぜん員いんが挨あい拶さつをした。
All employees exchanged New Year's greetings on the first day back at work.

御ご用よう始はじめ
御用始め is a more formal term used especially for government offices resuming work, while 仕事始め is the general word used for any workplace.

仕し事ごと納おさめ
仕事納め is the last day of work before the New Year holiday, while 仕事始め is the first day back afterward.

Compound of 仕事 (work) and 始め (beginning). The term is culturally tied to the Japanese custom of returning to work after the New Year's holiday.