the father of one's father or mother (外)祖父 ■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之父。
verb
[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可以不受其限制。