late 14c., from Old English byrddæg, "anniversary celebration of someone's birth" (at first usually a king or saint); see birth (n.) + day. Meaning "day on which one is born" is from 1570s. Birthnight is attested from 1620s.
权威例句
1. I might buy one for a friend's birthday as a giggle.
我可能会买一件送给朋友当生日礼物,逗他开心。
2. Her children had the best, most elaborate birthday parties in the neighborhood.
她的孩子们的生日聚会在街坊四邻里是最好、最讲究的。
3. He was knighted in the Queen's birthday honours list in June 1988.
他于1988年6月被封为爵士,是女王生日宴会上的受勋者之一。
4. He died two days shy of his 95th birthday.
他在离95岁寿辰仅差两天时去世了。
5. He asked his daughter what she would like for her birthday.