据说，a shotgun marriage (或a shotgunwedding)这个表达源于二、三百年前的美国。有一女子跟男友意外怀孕，事发后男友却不愿承担责任，于是，女子的父亲便手持猎枪(shotgun)威胁其男友，要他们完婚给自己女儿一个交代。
A shotgun marriage 的定义是：one or both parties are forced into marriage due toan unplanned pregnancy(一方或双方由于意外怀孕而不得以结婚)。
例如：It looks like that it's a shotgun marriage for those two.
看上去这两个人好像是奉子成婚。