- (v.t.) To mark a line below, as words; to underscore.
- (v.t.) To influence secretly.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). underline. Retrieved September 22, 2026, from http://smartdefine.org/underline/definitions/2076703 |
| Chicago | Webster's. 2011. "underline" http://smartdefine.org/underline/definitions/2076703 (accessed September 22, 2026). |
| Harvard | Webster's 2011, underline, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/underline/definitions/2076703>. |
| MLA | Webster's. "underline" 28 May 2011. Web. 22 September 2026. <http://smartdefine.org/underline/definitions/2076703> |