Hello, you have come here looking for the meaning of the word on guard. In DICTIOUS you will not only get to know all the dictionary meanings for the word on guard, but we will also tell you about its etymology, its characteristics and you will know how to say on guard in singular and plural. Everything you need to know about the word on guard you have here. The definition of the word on guard will help you to be more precise and correct when speaking or writing your texts. Knowing the definition ofon guard, as well as those of other words, enriches your vocabulary and provides you with more and better linguistic resources.