adjective
- Vigilant.
- usage: "on guard against con artists"; "must remain on your guard in such a situation"
- synonyms: on guard, on one's guard, on your guard
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). upon one's guard. Retrieved September 22, 2026, from http://smartdefine.org/upon_one%27s_guard/definitions/1187622 |
| Chicago | WordNet. 2010. "upon one's guard" http://smartdefine.org/upon_one%27s_guard/definitions/1187622 (accessed September 22, 2026). |
| Harvard | WordNet 2010, upon one's guard, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/upon_one%27s_guard/definitions/1187622>. |
| MLA | WordNet. "upon one's guard" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/upon_one%27s_guard/definitions/1187622> |