During some kind of repetitive task which doesn't involve thinking, I lost my
concentration and forgot what I was doing. When I told someone about this I
said 途中でぼけてしまった but I wonder if that is the best way to describe such an
occurrence. 途中で集中しなくなった sounds quite odd to me somehow. 集中を失った would be a
translation of "lose concentration" in English but I'm not sure that is good
Japanese. Is 途中で間を抜けた or something like that too strange?
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2020-03-02T12:22:50.877
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2020-03-02T13:26:51.800
2020-03-02T13:26:32.623
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question
translation word-choice phrase-requests
Losing concentration
I think

> 途中でボケてしまった

is a valid way to relate the fact that you lost your concentration, but I
guess it is rather colloquial.

You could also say

> 気が逸れてしまいました

which could mean that something else _caught_ your attention, but I guess this
"something" could just be another thought, in which case it would just mean
that your _attention drifted_.

If you want to use 集中, then I think

> 集中ができなくなった

is better.

Finally, 集中を失った seems to exist, but it sounds more like a medical condition
and I don't think it quite fits the situation here.
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2020-03-02T13:26:21.450
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2020-03-02T13:26:21.450
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answer
I think

> 途中で間を抜けた

is bit too awkward to describe "losing concentration" since it sounds like
you've left the place in the middle of talking. A similar expression :

> 途中で間が入った

can be used when your activity was paused while you are staying in the same
place.

When you feel losing concentration while doing tasks you are getting used to
such as routine chore, I would feel

> ボーっとしてきた。: Absent-mindedness.
>
> 集中力が途切れてきた : Concentration has started to lose.
>
> 気が抜けてきた : Losing motivation.
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2020-03-02T13:26:51.800
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2020-03-02T13:26:51.800
2020-06-17T08:18:27.500
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answer