down a hair
what does 'down a hair' mean?
But the incarceration rate is actually down a hair in recent years, though no country that isn't actually a prison with a flag can compete with what the U.S. has done to itself. So, as we consider alternatives to prison for offenders, we need to remember that the act of arresting people is perilous in and of itself.

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Answer

Hey Jose,

It means that the incarceration rate has fallen slightly. A hair is very thin, and sometimes used as a metaphor for a very slight amount.

Laurence

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