blow hot and cold
US /bloʊ hɑt ənd koʊld/
UK /bləʊ hɒt ənd kəʊld/
成语
忽冷忽热, 反复无常
to keep changing one's mind about something or someone, or to be inconsistent in one's attitude or behavior
示例:
•
He keeps blowing hot and cold about the new project, so I don't know what he really wants.
他对新项目总是忽冷忽热，所以我不知道他到底想要什么。
•
Their relationship is unstable because they always blow hot and cold with each other.
他们的关系不稳定，因为他们总是对彼此忽冷忽热。