have/keep one's guard up
idiom
: to be careful and alert
He always has/keeps his guard up during negotiations.
Cite this Entry
“Have/keep one's guard up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/have%2Fkeep%20one%27s%20guard%20up. Accessed 22 May. 2025.
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