I think you went a little overboard when you hit your son because he didn't get an A on his test.

我觉得你因为儿子考试没得到 A 就揍他，这实在是太过份了。

go overboard 太过份了

解说：overboard 单独一个字时，表「船外；（自船上）落水」，但若是词组 go overboard 的话，则指「（反应、行为）等太过火了；太过份了」，和「船」并没什么关系，请读者留意。