• n. 一天；时期；白昼
• adv. 每天；经常在白天地
• adj. 日间的；逐日的
• n. (Day)人名；(英、法、西)戴；(越)岱；(阿拉伯、土)达伊

来自PIE*dhegwh, 燃烧，发光，词源同fever, yester.引申义天亮，白天。

day

day: [OE] Day and its Germanic relatives (German tag, Dutch, Danish, and Swedish dag, and Gothic dags) come from a prehistoric Germanic *dagaz. It seems likely that the ultimate source of this was the Indo-European base *dhegh-, which also produced Sanskrit dah- ‘burn’ and nidāgha- ‘heat, summer’, and that the underlying etymological meaning of day is thus ‘time when the sun is hot’.
=> dawn

day (n.)

Old English dæg "day," also "lifetime," from Proto-Germanic *dagaz "day" (cognates: Old Saxon, Middle Dutch, Dutch dag, Old Frisian dei, Old High German tag, German Tag, Old Norse dagr, Gothic dags), according to Watkins, from PIE *agh- (2) "a day" considered as a span of time. He adds that the Germanic initial d- is "of obscure origin."

Not considered to be related to Latin dies (see diurnal), but rather to Sanskrit dah "to burn," Lithuanian dagas "hot season," Old Prussian dagis "summer." Meaning originally, in English, "the daylight hours;" expanded to mean "the 24-hour period" in late Anglo-Saxon times. The day formerly began at sunset, hence Old English Wodnesniht was what we would call "Tuesday night." Names of the weekdays were not regularly capitalized in English until 17c. Day off first recorded 1883; day-tripper first recorded 1897. The days in nowadays, etc. is a relic of the Old English and Middle English use of the adverbial genitive.

1. Carpe diem. Seize the day, boys. Make your lives extraordinary.

人生就应该是快乐的，要抓住每一天，孩子们，让你们的生活变得非凡起来。

来自电影《死亡诗社》

2. On Sunday Cohen lay around the house all day.

科恩星期天一整天都在家无所事事。

来自柯林斯例句

3. Someone comes in every day to check all is in order.

每天都有人来检查是否一切都井然有序。

来自柯林斯例句

4. Try these toning exercises before you start the day.

在开始一天的活动之前，试着做做这些强身健体的体操。

来自柯林斯例句

5. Loyalty and support became the bywords of the day.

忠诚和支持成了那个时代人们时常挂在嘴边的词儿。

来自柯林斯例句