on one's guard

idiom

: watching for possible danger, threats, problems, etc.
inspectors on their guard for certain violations that are often overlooked

Browse Nearby Entries

Cite this Entry

“On one's guard.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20one%27s%20guard. Accessed 27 Feb. 2025.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!