underpins is a form of:

Underpin



verb — past tense: underpinned ; past participle: underpinned ; present participle: underpinning ;
1.
(បច្ចេកទេស) ពង្រឹង, បង្កើតជាមូលដ្ឋានសម្រាប់ទ្រទ្រង់
ENGLISH MEANING
verb — past tense: underpinned ; past participle: underpinned ; present participle: underpinning ;
1.
(TRANSITIVE) To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest.
2.
(TRANSITIVE) To support by some solid foundation; to place something underneath for support.