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his crushed nose gave away his passion for boxing = his crushed nose offered convenience for his passion for boxing?

Context:
Balbus was shorter and darker-skinned, but his eyes were blue and his crushed nose gave away his passion for boxing. Metellus put on his helmet,
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No - his broken nose indicates that he enjoys the sport of boxing. It has been broken several times.
Comments  
No, 'gave away' doesn't mean 'offered convenience'.

It means 'revealed'.

You could tell he had a passion for boxing because of his crushed nose.
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