take it into your head to do something idiom
忽发奇想，心血来潮
to suddenly decide to do something, often something silly or surprising
Anyway, they took it into their heads to get married. 不管怎样，他们突然心血来潮，决定结婚。
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。