| slash | |
| splotch(verb, check, mark, stain, blemish) | |
| spot(verb, repeat, emphasize, accentuate) | |
| stain(verb, mark, draw, blemish, scratch) | |
| stigmatize | |
| streak(noun, verb, check, mark, stain) | |
| virgule | |
| X(mark, draw, stain, blemish, impress) | |
| add fuel to fire(verb, expression, idiom, support, increase) | |
| add to(verb, expression, support, increase, boost) | |
| affirm(verb, charge, mark, maintain, hit) | |
| ascribe | |
| assert(verb, charge, mark, maintain, hit) | |
| attest | |
| augment(verb, support, increase, boost, sustain) | |
| autograph(verb, check, mark, stain, blemish) | |
| back up(verb, expression, support, increase, boost) | |
| beef up(verb, expression, support, increase, boost) | |
| belabour | |
| blaze a trail(expression, idiom) |
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| APA | Smart Define. (2015). underline thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/underline/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "underline thesaurus" https://smartdefine.org/underline/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, underline thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/underline/thesaurus/synonyms>. |
| MLA | Smart Define. "underline thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/underline/thesaurus/synonyms> |