on one's guard
idiom
: watching for possible danger, threats, problems, etc.
inspectors on their guard for certain violations that are often overlooked
Dictionary Entries Near on one's guard
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“On one's guard.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20one%27s%20guard. Accessed 28 Apr. 2024.
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