CDW is an acronym that stands for Collision Damage Waiver. However, there are many different ways to say the same thing which means there are a number of synonyms for the term. Some possible alternatives are Loss Damage Waiver (LDW), Additional Liability Insurance, or Limited Damage Waiver. Essentially, all of these mean the same thing, which is that you are agreeing to pay a certain amount if your rental car is damaged during the rental period. It is always important to read the fine print when signing any rental agreement, so you fully understand the details and any associated costs that may be involved.