wishes of happiness; respectful congratulations
Humble expression used in formal New Year's greetings, especially in the phrase 謹賀新年 (きんがしんねん), meaning 'Happy New Year' with a respectful tone.
I write 'Happy New Year' (respectfully) on New Year's cards.
Compound of 謹 (きん, 'respectfully') and 賀 (が, 'congratulations'). The exact historical derivation is uncertain, but it is a Sino-Japanese word used in formal contexts.