Things easily get moldy during the plum rain season.
Tips
usage
Key compounds: 发霉 (fāméi, to go moldy), 倒霉 (dǎoméi, unlucky), 霉菌 (méijūn, mold/fungus). The 'bad luck' meaning comes from 倒霉, one of the most common colloquial expressions.
memory
霉 has 雨 (rain) on top — moisture causes mold. The plum rain season (梅雨) sounds the same as 'moldy rain' (霉雨), which is how the season got its nickname.