# underlie vs underpin

> English confusable word pair

## The two words

### underlie
*verb · IPA /ˌʌn.dəˈlaɪ/ · frequency rank #42,970*
To lie in a position directly beneath something.

### underpin
*verb · IPA /ˌʌn.dəˈpɪn/ · frequency rank #43,448*
To support from below with props or masonry.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/underlie-vs-underpin