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Context: in a boxing match, boxer A is fighting against the particularly tough
boxer B. Even after having taken a lot of punches, boxer B is still standing.
During a break, the trainer of boxer A says:

> タフネスにも **スイッチ** がある。ちゃんと殺しきれよ… ガキ…

I think that スイッチ has a metaphorical meaning here. Since it is usually
associated with switching things on/off, could it mean something like `a way
to stop` or `a way to defeat`? How would you translate it? My translation
attempt:

> Even toughness can be stopped in some way. You must totally destroy him,
> kid...

Thank you for your help!

EDIT: for more context, I can say that boxer B is a 打たれ強い boxer. He's an ex
kick-boxer who says that boxing punches are 'light' compared to the kicks you
get in kick-boxing. Being not afraid of punches, he advances to get close to
his opponent even while being hit. He is an infighter, a boxer who fights at
close distante from his opponent. [Here's the entire page the sentence is
taken from.](https://i.stack.imgur.com/1VeLW.jpg) In this page Boxer B has
just got up after being knocked down by Boxer A. For further context, here are
the following pages: [28-29](https://i.stack.imgur.com/FTwIQ.jpg) and
[30-31](https://i.stack.imgur.com/7GcEK.jpg). The manga is called
[リクドウ](https://ja.wikipedia.org/wiki/%E3%83%AA%E3%82%AF%E3%83%89%E3%82%A6).
CC BY-SA 3.0
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question
meaning katakana loanwords metaphor sports
Meaning of スイッチ in the following sentence
Even devices that produce great force will move or stop depending on the on /
off of the switch.

In this case, I think that the phrase means that you should turn off or
destroy the opponent's switch properly so that you definately stop the supply
of his toughness to demonstrate; in other words, you should aim at the
opponent's **weak points** or **vital points** in order to let the opponent
never attack you.
CC BY-SA 3.0
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answer
In my opinion, Boxer B was knocked down in 1st round because his body was not
warm enough or something. I think that it's not normal in the real boxing
though, the trainer worries about boxer B will get used to the Boxer A's hard
punches as the round goes on if the **toughness switch on**. The trainer said
the boxer A should have completely knocked him out in the 1st round. My
interpretation.

After I read the pages, boxer B was knocked down(flash-down: not so much
damage since boxer B was not get used to the boxer A's punches trajectory) by
boxer A's counter-punch in 1st round. So, boxer B doesn't carry over his
damage to next round and he may recover quickly during the round interval.
CC BY-SA 3.0
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answer