on one's guard

1. 1.

   vigilant

   “on guard against con artists”

   “must remain on your guard in such a situation”

   Synonymson guardupon one's guardon your guard

   Similarwary

Questions about on one's guard

What does on one's guard mean?

on one's guard means "vigilant".

What is another word for on one's guard?

Close synonyms include on guard, upon one's guard, on your guard. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.