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.

Dictionary Entries Near too big for one's britches

too big for one's boots

too big for one's britches

too clever by half

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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 31 Mar. 2023.

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