too big for one's britches
idiom
US, informal
: too confident or proud of oneself
I think the boss is growing too big for his britches.
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“Too big for one's britches.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/too%20big%20for%20one%27s%20britches. Accessed 26 Apr. 2024.
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