Might mean (unverified): Non-biological brother through marriage.
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We found one dictionary that defines the word stepbro:

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  1. stepbro: Wiktionary

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Definitions from Wiktionary (stepbro)

▸ noun:  (informal, endearing) A stepbrother.

Similar:
step-brother, stepbrother, step, kid brother, step-nephew, stepbrotherhood, stepnephew, little brother, stepniece, stepdad, more...

Opposite:
stepsister, half-brother, non-stepbrother

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Similar:
step-brother, stepbrother, step, kid brother, step-nephew, stepbrotherhood, stepnephew, little brother, stepniece, stepdad, more...

Opposite:
stepsister, half-brother, non-stepbrother



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