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> 仕事を終えた労働者が、ダンジョンから無事戻ってきた冒険者達が、 **今日も一日** の締めくくりとばかりに酒盛りに耽っている。

This is the first time I have come across this. What exactly does it mean and
how would I use it? I've seen it in other sentences too like:

> **今日も一日** 頑張りましょう！
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2015-08-09T10:28:34.793
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meaning phrases
Meaning of 今日も一日？
We have two very different 「今日{きょう}も一日{いちにち}」's here.

> 「 **今日も一日** の締{し}めくくりとばかりに酒盛{さかも}りに耽{ふけ}っている。」

＝

> 「 **今日も** 、 **一日** の締{し}めくくりとばかりに酒盛{さかも}りに耽{ふけ}っている。」

≒

> 「 **一日** の締めくくりとばかりに、 **今日も** 酒盛りに耽っている。」

Here, 「今日も ("today also")」 and 「一日 (the "work" day)」 function separately and
independently from each other. Grammatically, it is **_not_** the same 「今日も一日」
that we use very often as a set phrase.

" ** _Today, too,_** (they are) indulged in a drinking party as if it were the
closing ceremony of **_the day_**."

Moving on...

The insanely common set phrase that I am talking about is the "other" 「今日も一日」
seen below.

> 「 **今日も一日** 頑張{がんば}りましょう！」

Here, 「今日も一日」 means " **today as usual** " or even just " **as always** ". It
works adverbially.

"Let us work hard (today) **_as usual_**!"
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2015-08-09T11:22:47.040
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I think there is an emphasis on 1日 when you say that 今日も１日 一生懸命に働こう. That is,
it means Let's work hard "for a whole day" today (as well as yesterday).
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2016-10-21T01:35:28.360
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answer