“意气相投”常见的英文表达有 “be in harmony with each other”、“hit it off” 或 “get along well with each other and share similar interests or outlooks”（此为更详细的解释性翻译）。
“be in harmony with each other” 侧重于表达彼此之间在思想、情感等方面协调一致，有“意气相投、相处融洽”的意思。例如：The two friends are always in harmony with each other.（这两位朋友总是意气相投 。）
“hit it off” 是较为口语化的表达，意思是“一见如故；合得来；意气相投” 。例如：We hit it off immediately and became good friends.（我们一见如故，很快成了好朋友。 ）
“get along well with each other and share similar interests or outlooks” 是一种较为详细的解释性翻译，直接说明了“意气相投”所包含的“相处得好”以及“有相似兴趣或观点”的含义 。