self-operating device
nounUK /ˌself ˈɒpəreɪtɪŋ dɪˈvaɪs/
US /ˌself ˈɑːpəreɪtɪŋ dɪˈvaɪs/
A machine that works by itself without a person making it go.
The self-operating device cleaned the floor all by itself.
RELATED WORDS
OTHER MEANINGS
2. A tool that starts and runs on its own once switched on.
This self-operating device turns off when the room is empty.
3. A machine that needs no human hand to keep working.
The factory uses a self-operating device to sort the boxes.
4. An automatic gadget that does a job without help.
A self-operating device waters the plants every morning.