Definition of watch one's back
: be careful
I hear the boss is in a bad mood this morning, so you'd better watch your back. She has to watch her back around them.
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“Watch one's back.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/watch%20one%27s%20back. Accessed 30 Jul. 2021.
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