We found one dictionary that defines the word upon one's guardp:

General (1 matching dictionary)

1. upon one's guardp: Rhymezone

Definitions from WordNet (upon one's guardp) ▸ adjective:  vigilant ▸ Words similar to upon one's guardp ▸ Usage examples for upon one's guardp ▸ Idioms related to upon one's guardp ▸ Wikipedia articles (New!) ▸ Popular nouns described by upon one's guardp ▸ Words that often appear near upon one's guardp ▸ Rhymes of upon one's guardp ▸ Invented words related to upon one's guardp