auspicious dream; lucky dream
A dream believed to foretell good fortune or a positive omen. Often used in traditional or literary contexts.
It is said that if you have an auspicious dream as your first dream of the year, you will be blessed with good luck that year.
Compound of 瑞 (zui, 'auspicious, good omen') and 夢 (mu, 'dream'). The exact historical derivation is uncertain, but the kanji combination directly conveys the meaning of a fortunate dream.