What is the purpose of repeated words?


I came across 2 sentences that include the repeated words.

1) **流れ流れた** ドヤ街で へんなおやじにつきまとわれて...

2) マスコミ利用し世間からせしめた黄金百万両！ **御用御用** とむらがる捕り手あたるをさいわいぶったおし...

I would like to know if there is any meaning other than their literal
meanings. Or is the purpose of repeated words just emphasizing their original
meaning?




1) This kind of repeated verbs express the action that happened repeatedly, or
for a long time. The effect is not very different from how English speakers
say "He ran and ran" and such. In addition, this 流れ流れた has 7 morae, and you
can see this forms a good 七五調 rhythm like
[_waka_](https://en.wikipedia.org/wiki/Waka_\(poetry\)).

> 流れ流れた(7) - ドヤ街で(5) - へんなおやじに(7) - つきまとわれて(7) ...

2) 御用! (or 御用だ!) is a phrase which was actually shouted by [policemen in the
Edo period](https://en.wikipedia.org/wiki/Edo_period_police) (well, [at least
in dramas
today](http://news.livedoor.com/article/image_detail/5430414/?img_id=1817082)).
So 御用 is naturally repeated, as shown in [the dictionary
example](http://dictionary.goo.ne.jp/jn/82495/meaning/m0u/) below:

> ３ 捕り手が官命で犯人を捕らえること。また、 **そのときのかけ声** 。転じて、警察につかまること。 **「―、―、神妙にしろ」** 「―になる」

