variants:
or co-prisoner
plural coprisoners or co-prisoners
Definition of coprisoner
: a fellow prisoner
Among his co-prisoners in Vietnam was future Arizona senator and Republican presidential candidate John McCain, whose Navy aircraft was shot down over Vietnam in 1967. McCain and Bell were in the same compound at one point and had given each other haircuts.— Bart Barnes
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Merriam-Webster unabridged
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Time Traveler for coprisoner
The first known use of coprisoner was in 1837
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