Happy New Year
Happy New Year!
expression
Remember how you learned that 新年 means "New Year?" Well when you say humble congratulations on the new year, you're really saying Happy New Year!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
年賀状には謹賀新年と書いてありました。
Happy New Year! was written on the New Year’s card.