"To secure the line" means to make sure that a communication or connection is protected or safe from any unauthorized access or interference. Full definition
In the case of secured line of credit, you need to back up the credit with collateral such as house, vehicles and other valuable property. (myfinancekits.com)
If you apply for secured line of credit which requires that you provide the financial institution with collateral, you can easily lose the property if you are unable to pay back the credit. (myfinancekits.com)
Why shouldn't we all just go out and get secured lines of credit instead of conventional mortgages? (hoyes.com)