A more thorough explanation:

A check-off system is a process where an employer takes out union dues from an employee's paycheck and sends it directly to the union. This is done with the employee's permission.

Let's say that John is a member of a union. He gives his employer permission to take out $50 from his paycheck every month and send it to the union. This is done automatically, so John doesn't have to worry about sending the money himself.

Another example is if a company has a collective bargaining agreement with a union. The agreement may include a check-off system where the employer deducts union dues from the employee's paycheck and sends it to the union.

These examples illustrate how a check-off system works. It simplifies the process of paying union dues for employees and ensures that the union receives the correct amount of money.