1. to support or strengthen the foundation of a building or structure
Usage: construction; technical
2. to form the basis for or provide fundamental support to something

Examples

• The engineers had to underpin the old building’s foundation before renovation.
• Steel beams were used to underpin the sagging structure.
• Strong evidence underpins her theory about climate change.
• The research underpins our understanding of the disease.
• Democratic principles underpin the nation’s constitution.
• Years of training underpin his success as an athlete.
• Scientific data underpins the new policy recommendations.