self-acting assembly
nounUK /ˌself ˈæktɪŋ əˈsembli/
US /ˌself ˈæktɪŋ əˈsembli/
A self-acting assembly is a group of parts that put themselves together and work on their own.
The toy robot is a self-acting assembly that snaps together and moves by itself.
OTHER MEANINGS
2. A machine or device that assembles itself without human help.
The factory uses a self-acting assembly to build tiny motors.
3. A group of people who organize and act without outside direction.
The volunteers formed a self-acting assembly to clean the park.
4. In computing, a program that builds its own components automatically.
The software includes a self-acting assembly that installs its own modules.