too big for one's britches

idiom

Definition of too big for one's britches

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.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/too%20big%20for%20one's%20britches. Accessed 19 January 2020.

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