Underpin (verb)

1. To support or strengthen something, especially the foundation of a building.
2. To provide a basis for something; to form the foundation of something.

Origin:

Under + pin.

Examples:

1. The engineers had to underpin the building's foundation to prevent it from collapsing.
2. He used statistics to underpin his argument.
3. The company's financial stability underpinned the success of the business.
4. The research findings underpinned the validity of the new treatment.
5. The recent developments in technology have underpinned many new startups.