縁起がいいこと
It is a good omen―lucky―auspicious―It augurs well―brings luck.
a bad omen
縁起を担ぐこと
縁起の悪いこと
縁起のいい出来事
縁起のいいことと悪いこと
the action of celebrating in order to turn bad luck into good luck
It is a common saying that chopsticks breaking in one's hand is a bad omen.
an unlucky day on which to do something
It is ill-omened―ominous―sinister―unlucky.