/ˈdʒeɪl bɜrd/ – Phrase
Definition: (Mỹ) 1. người đã mãn hạn tù, tù nhân;
2. cựu tù nhân, tội phạm cứng đầu, tội phạm đã có nhiều tiền án.
A more thorough explanation: The term “gaol-bird” refers to a person who has been convicted of a crime and is serving a sentence in jail or prison.
Example: The judge sentenced the gaol-bird to five years in prison for his repeated offenses.