We found 10 dictionaries that define the word on one's guard:

General (10 matching dictionaries)

1. on one's guard: Merriam-Webster
2. on one's guard, on one's guard: Oxford Learner's Dictionaries
3. on one's guard, on one's guard: Collins English Dictionary
4. on one's guard: Vocabulary.com
5. on one's guard: Wordnik
6. on one's guard: Wiktionary
7. On one's guard, on one's guard, on ones guard: Dictionary.com
8. on ones guard: FreeDictionary.org
9. on one's guard: Mnemonic Dictionary
10. on one's guard: TheFreeDictionary.com

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