The phrase "test dummy" commonly refers to a human-like object used to test the safety and effectiveness of products or experiments. It can also mean a person who is used to try out something new or risky before others. Full definition
A crash test dummy in the beginning was basically a few wooden pieces placed together. (carseat.se)
The ratings are based on evaluations of how three - point lap and shoulder belts fit a child - size test dummy seated in the booster on a stationary test fixture. (iihs.org)
Imagine a crash test dummy so brilliant that instead of the typical 119 points of data, it could give you millions. (lexus.com)