cloud over phrasal verbphr v a) DN (also cloud up American EnglishAmE)DARK if the sky clouds over, it becomes dark and full of black clouds 〔天空〕阴云密布,乌云翻滚
b) ANGRYSAD/UNHAPPYif someone’s face or eyes cloud over, they start to look angry or sad 〔脸上或眼睛〕露出愠怒[悲伤]的神色 His face clouded over in disappointment. 他一脸失望的神情。
→ cloud over at cloud2(2)