Test-fire is a phrase that's commonly used when referring to discharging a weapon or testing equipment like engines and devices. However, there are several synonyms for test-fire that can be used to describe the same action. Words like trial, experiment, assessment, evaluation, and examination can all be used as alternatives to test-fire. Similarly, terms like try out, put to the test, put through the paces, and gauge can be used interchangeably with test-fire. Whatever word you use, the idea is to check the efficiency, performance, and reliability of a device or equipment. So, whether you're firing a gun or assessing a machine, make sure it's done with the utmost care and precision to avoid any mishap.