automatic-locking
adjectiveUK /ˌɔːtəˈmætɪk ˈlɒkɪŋ/
US /ˌɔːtəˈmætɪk ˈlɑːkɪŋ/
Something that locks by itself without a person doing it.
The car has automatic-locking doors that lock when you start driving.
RELATED WORDS
OTHER MEANINGS
2. A feature that locks something on its own after a set time or action.
The phone's automatic-locking screen turns off after one minute.
3. A system that secures a door or gate without a key or hand.
The building uses an automatic-locking gate at night.
4. Describing a device that fastens itself when triggered.
The suitcase has an automatic-locking zipper.