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What is the meaning of タガとして in this sentence?

> 革新勢力が、保守陣営を大きく制約する **タガとして** 機能する...
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2017-04-02T10:47:20.700
45142
2023-02-13T18:14:46.347
20507
question
meaning
Meaning of ~タガとして
> 「革新勢力{かくしんせいりょく}が、保守陣営{ほしゅじんえい}を大{おお}きく制約{せいやく}するタガとして機能{きのう}する...」

「タガ」 originally means "hoops". There is a kanji for it ,「箍{たが}」, but that is
not taught in Japanese schools, so feel free to write it in kana.

[![enter image description
here](https://i.stack.imgur.com/hw6CJ.jpg)](https://i.stack.imgur.com/hw6CJ.jpg)  
(source: [yimg.jp](https://iwiz-chie.c.yimg.jp/im_siggbPS3lnFCOmieZqQBB9Y68Q
---x320-y320-exp5m-n1/d/iwiz-chie/ans-415618450))

「たが/タガ」 are what keep all the wood pieces of a barrel together. Without them,
you only have separate pieces of wood that will not function as a tool.

In the sentence in question, 「タガ」 is used figuratively to mean " _
**controlling power over another**_ ".

> "The progressive forces function as the controlling power in greatly
> restricting the conservative camp."

「タガとして」 = "as the hoops" → "as the (inconspicuous) controlling power"
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2017-04-02T11:14:58.060
45143
2023-02-13T18:14:46.347
2023-02-13T18:14:46.347
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45142
answer