IPA: /ˌʌndərˈreɪt/
KK: /ʌndərˈreɪt/
To judge something as less important or valuable than it really is.
Many people tend to underrate the impact of small actions on the environment.
Past: underrated
Past Participle: underrated
Underrate → It is formed from "under-" (meaning below or beneath) and "rate" (from Old French *rate*, meaning to estimate or assess). The word means to assess something as being of lower value or importance than it actually is.
Think of estimating something as being 'below' ('under-') its true value — that's why to underrate means to underestimate.