expression
A formal written New Year's greeting, typically used on cards or in letters. More formal than 明けましておめでとうございます.
年賀状に「謹賀新年」と書く。
I write 'Happy New Year' on my New Year's cards.
The standard spoken New Year's greeting; less formal than 謹賀新年, which is mainly written.
A Sino-Japanese compound of 謹 (respectfully), 賀 (congratulate), 新 (new), and 年 (year).