spring-loaded 
adjective
Containing a compressed or stretched spring pressing one part against another: a spring-loaded clothes peg...
- The doors are spring-loaded so that, at the point of being halfway closed, the spring will take over and slam the door shut and hold it closed.
- In the market I found almost everyone sold heavy, serrated, spring-loaded metal rattraps.
- This knife was like a switchblade, except that the blade was spring-loaded to shoot straight out of the handle and lock when you pressed the release button, rather than opening sideways.
Rhymes
- BlackBerry thumb
- blackberry winter
- black betty
- black bile
- black bill
- black-billed
- black-billed cuckoo
- black bindweed
- blackbird
- blackbirder
- blackbirding
- black blizzard
- black-blooded
- blackboard
- blackboard jungle
- black body
- black-body radiation
- black bog
- black bomber
- black book
- black bottom
- black-bottomed
- black bottom pie
- black box
- black box theater