Final answer:
The phrase 'welcome to the club, brother' is an idiomatic expression that signifies shared experiences or common understandings, suggesting solidarity or empathy among those who have undergone similar situations.
Step-by-step explanation:
When the man tells the cop 'welcome to the club, brother', he's using an idiomatic expression. This phrase typically means that the person being spoken to has experienced something that the speaker and others have already experienced, thereby joining a common experience or a shared understanding. It's a way of expressing empathy or solidarity, suggesting that the cop is now part of a group who has faced similar situations or challenges.