凶兆 literally means 'ominous sign' — 凶 (xiōng) means 'fierce', 'dangerous', or 'inauspicious', and 兆 (zhào) means 'omen', 'portent', or 'sign'. Together, they form a formal, literary noun meaning 'bad omen' — a warning sign believed to predict misfortune, disaster, or failure. It’s often used in contexts involving superstition, folklore, literature, or dramatic storytelling.

The term carries strong connotations of foreboding and is rarely used in casual daily speech. You’ll commonly encounter it in classical texts, historical narratives, news commentary about crises (e.g., economic collapse or natural disasters), or when describing unusual animal behavior interpreted as a warning — such as crows gathering at dusk or snakes appearing in villages before earthquakes. While not scientifically grounded, 凶兆 reflects deep-rooted cultural associations between natural phenomena and human fate.