When it comes to finding synonyms for the phrase "crash-test", there are a few different options to choose from. One possible synonym could be "safety testing", which refers to the process of evaluating a product's safety features to ensure they meet certain standards. Another possible synonym might be "impact testing", which focuses specifically on evaluating how a product or material responds to various kinds of impact. Additionally, "collision testing" could be considered a synonym for "crash-test", since it also involves evaluating the performance of a product in a collision scenario. Overall, there are a range of different phrases and terms that can be used to describe the process of testing a product's safety and durability in various conditions.