have/keep one's guard up

idiom

Definition of have/keep one's guard up

: to be careful and alert He always has/keeps his guard up during negotiations.

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“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 31 Oct. 2020.

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