built-in design
nounUK /ˌbɪlt ˈɪn dɪˈzaɪn/
US /ˌbɪlt ˈɪn dɪˈzaɪn/
A built-in design is something made as a fixed part of a thing, not added later.
The shelf has a built-in design, so it cannot be moved.
OTHER MEANINGS
2. A design that comes already included in a product or system.
The phone's built-in design includes a camera and a speaker.
3. A planned feature that is part of the original plan.
The park's built-in design gives kids a safe place to play.
4. A quality that is naturally part of something.
Kindness is a built-in design of her personality.