omen

预兆、征兆、兆头

Many people see a black cat as a bad omen.

很多人把黑猫视为不祥的预兆。

吉兆、好兆头

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

婚礼当天天气晴朗，被大家当成好兆头。

预示、预兆正式

The sudden silence seemed to omen trouble ahead.

突如其来的寂静似乎预示著麻烦即将到来。