plug-in device
nounUK /ˈplʌɡ.ɪn dɪˌvaɪs/
US /ˈplʌɡ.ɪn dɪˌvaɪs/
A plug-in device is a small machine you connect to a power socket or computer to make it work.
She plugged the little plug-in device into the wall to charge her phone.
OTHER MEANINGS
2. A piece of software that adds new features to a larger program.
He installed a plug-in device for his photo editor to add fun filters.
3. Something that connects to a system to give it extra power or ability.
The new plug-in device lets the old speaker play music from a laptop.
4. A gadget that must be plugged into electricity to run.
The plug-in device on the counter keeps the kitchen smelling fresh.