English dictionary
upon one's guard meaning and definition
Definition and meaning of upon one's guard at MeaningMonkey.org. upon one's guard meaning and definition in the English Dictionary.UPON ONE'S GUARD adjective
Definition of upon one's guard (adjective)
- vigilant
- "on guard against con artists"; "must remain on your guard in such a situation"
- synonyms: on guard, on one's guard, on your guard
Source: Princeton University Wordnet