The term 'jailbird' often implies a negative judgment about the person's criminal behavior. The old town gossip referred to the recently released man as a jailbird.
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Colloquial Use
'Jailbird' is informal and mostly used in casual speech, not in formal writing. At the family barbecue, Uncle Joe joked about his youth as a jailbird.
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Cultural Perception
In some cultures, calling someone a 'jailbird' can be a serious insult. When she called him a jailbird, everyone knew the argument had escalated.