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We found 20 dictionaries with English definitions that include the word on guard: Click on the first link on a line below to go directly to a page where "on guard" is defined. General (15 matching dictionaries) on guard: Vocabulary.com [home, info] on guard: Merriam-Webster's Online Dictionary, 11th Edition [home, info] on-guard, on guard: Wordnik [home, info] on guard: Wiktionary [home, info] On guard, on (one's) guard, on guard: Dictionary.com [home, info] on guard: UltraLingua English Dictionary [home, info] On Guard (film), On Guard (serial), On Guard: Wikipedia, the Free Encyclopedia [home, info] on guard: Rhymezone [home, info] on guard: Free Dictionary [home, info] on guard: Mnemonic Dictionary [home, info] on guard: WordNet 1.7 Vocabulary Helper [home, info] on guard: LookWAYup Translating Dictionary/Thesaurus [home, info] on (one's) guard, on guard: Dictionary/thesaurus [home, info] Business (1 matching dictionary) on guard: Legal dictionary [home, info] Computing (1 matching dictionary) on guard: Encyclopedia [home, info] Miscellaneous (1 matching dictionary) on guard: Idioms [home, info] Sports (2 matching dictionaries) on guard: Hickok Sports Glossaries [home, info] On guard: Sports Definitions [home, info]

Quick definitions from WordNet (on guard) ▸ adjective:  vigilant ("On guard against con artists")