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預兆、徵兆、兆頭

Many people see a black cat as a bad omen.

很多人把黑貓視為不祥的預兆。

吉兆、好兆頭

Clear skies on the wedding day were taken as a good omen.

婚禮當天天氣晴朗，被大家當成好兆頭。

預示、預兆正式

The sudden silence seemed to omen trouble ahead.

突如其來的寂靜似乎預示著麻煩即將到來。