1
- the father of one's father or mother（外）祖父。
1.1
- the person who founded or originated something创办者; 创始人：
Freud is often called the grandfather of psychoanalysis.
弗洛伊德常被称为心理分析的鼻祖。
with obj.
- N. Amer. informal exempt (someone or something) from a new law or regulation〈北美, 非正式〉使（某人, 某事）免受新法律（或规定）的限制：
smokers who worked here before the ban have been grandfathered.
禁令开始之前在这里工作的吸烟者不受其限制。
派生词