day (n.)

古英语 dæg “太阳高于地平线的时期”, 也是“一生一世, 明确的存在时间”, 来自于原日耳曼语 *dages- “一天” (来源也是古撒克逊语, 中荷兰语, 荷兰语 dag, 古弗里斯兰语 di, dei, 古高德语 tag, 德语 Tag, 古北欧语 dagr, 哥特语 dags), 据Watkins说, 来自于PIE根 *agh- “一天”. 他补充说, 日耳曼语的首字母 d- “来源模糊”. 但Boutkan说它来自PIE根 *dhegh- “燃烧” (见 fever). 不认为与拉丁文 dies (来自PIE根 *dyeu- “照耀” )有关.

在英语中原意为“白天的时间”; 到了盎格鲁-撒克逊时代后期, 扩大为“24小时” 的意思. 以前的一天是从日落开始的, 因此古英语 Wodnesniht, 就是我们所说的“周二夜”. 直到17世纪, 工作日的名称在英语中才被定期大写.

从12世纪末开始作为“区别于其他时间段的一个时间段”. Day-by-day “每日” 出自14世纪末. all day “所有的时间” 是14世纪末的. Day off “一天不上班” 是从1883年开始考证的. day-tripper 1897年首次记载. nowadays, 等中的 days, 是古英语和中英语使用副词属词的遗迹.

All in a day's work “something unusual taken as routine” 是到1820年. 的怀旧 those were the days 是由1907年证明的. That'll be the day 在某种吹嘘或宣称之后表示轻度怀疑的, 是到1941年. 对 call it a day “停止工作” 是到1919年, 更早的 call it a half-day (1838年). One of these days “在不久的将来的某一天” 是15世纪末的. One of those days “不幸的一天” 是到1936年.

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Definitions of day
day (n.)
time for Earth to make a complete rotation on its axis;
they put on two performances every day
two days later they left
there are 30,000 passengers per day
Synonyms: twenty-four hours / twenty-four hour period / -hour interval / solar day / mean solar day
day (n.)
some point or period in time;
these days it is not unusual
after that day she never trusted him again
it should arrive any day now
those were the days
day (n.)
a day assigned to a particular purpose or observance;
day (n.)
the time after sunrise and before sunset while it is light outside;
the dawn turned night into day
Synonyms: daytime / daylight
day (n.)
the recurring hours when you are not sleeping (especially those when you are working);
my day began early this morning
it was a busy day on the stock exchange
she called it a day and went to bed
day (n.)
an era of existence or influence;
in the day of the dinosaurs
he was a successful pianist in his day
in the days of the Roman Empire
in the days of sailing ships
day (n.)
the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis;
how long is a day on Jupiter?
day (n.)
the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day;
Synonyms: sidereal day
day (n.)
a period of opportunity;
every dog has his day
he deserves his day in court
Day (n.)
United States writer best known for his autobiographical works (1874-1935);
Synonyms: Clarence Day / Clarence Shepard Day Jr.