What role is 一面 playing in "床は一面血まみれだった"?


The sentence

> 床は一面血まみれだった。

apparently translates to

> The floor was covered with blood.

**Question:** What role is 一面 playing in this sentence?

It seems to me that if we omitted that word entirely, the sentence would still
be translated as something like: "As for the floor, it was covered in blood".
So what role is 一面 playing (grammatically, and meaning wise)?




[It's being used
adverbially](https://dictionary.goo.ne.jp/word/%E4%B8%80%E9%9D%A2/#jn-12834),
and emphasises that the _whole surface_ was covered in blood. Perhaps you can
imagine a floor which was 血まみれ ("bloodstained") but not covered from edge to
edge in blood — this emphasises the completeness of the coverage, for dramatic
effect.




[It's being used
adverbially](https://dictionary.goo.ne.jp/word/%E4%B8%80%E9%9D%A2/#jn-12834),
and emphasises that the _whole surface_ was covered in blood. Perhaps you can
imagine a floor which was 血まみれ ("bloodstained") but not covered from edge to
edge in blood — this emphasises the completeness of the coverage, for dramatic
effect.

