spring-loaded
adjectiveUK /ˌsprɪŋ ˈləʊdɪd/
US /ˌsprɪŋ ˈloʊdɪd/
Something spring-loaded has a metal coil inside that pushes or pulls it back into place.
The spring-loaded door closed by itself after we walked through.
OTHER MEANINGS
2. Fitted with a spring that stores energy to make a part move quickly when released.
He pressed the spring-loaded button and the lid popped open.
3. Ready to act suddenly, as if released from tension.
Her spring-loaded reflexes let her catch the falling glass.
4. Designed to snap back into position automatically after being pushed.
The spring-loaded clip held the papers tightly together.