safetycatch
nounUK /ˈseɪfti kætʃ/
US /ˈseɪfti kætʃ/
A small part that stops something like a gun or a door from going off or opening by accident.
He flicked off the safety catch before firing.
OTHER MEANINGS
2. A locking device on a machine that prevents it from starting accidentally.
The safety catch on the press must be engaged before operation.
3. A small clasp that keeps a piece of jewellery from falling off.
The bracelet has a safety catch so it won't slip from your wrist.
4. A protective latch on a folding knife or tool that keeps the blade from closing unexpectedly.
Always check the safety catch on your pocket knife.