Think of 'build in' as designing something to have a specific feature from the start.

Part of Design

'Build in' implies the item is not an afterthought or added separately, but an integral part from the beginning.

Not Added Later

Built-in elements are often designed to blend with their surroundings for a seamless look.

When a characteristic is 'built in', it is seen as a natural part of someone or something, not easily altered.

If a habit or opinion is 'built in', it's usually hard to change because it's deeply ingrained.

In construction, 'build in' means creating something as part of the building itself, not a standalone piece.

'Build in' refers to functional parts of a structure that are planned and created as part of the whole.