From Longman Dictionary of Contemporary Englishunderscoreun‧der‧score /ˌʌndəˈskɔː $ -dərˈskɔːr/ ●○○ verb [transitive] especially American English 1 EMPHASIZEto emphasize the fact that something is important or true SYN underline► see thesaurus at emphasize2 LINEto draw a line under a word or phrase to show that it is important SYN underline→ See Verb table
Examples from the Corpus
underscore• The cultural significance of it is not really underscored.• But it is also worth underscoring both the intended and unintended symbolism of a Churchill bust.• This is further underscored in their social positions.• National defense constitutes over one-fourth of the Federal budget and underscores the high cost of military preparedness.• The report underscores the importance of childhood immunizations.• If single motherhood magnifies the problems of contemporary motherhood, it can also underscore the rewards of mothering while pursuing independent goals. 