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to be proud; to be haughty; to be arrogant; to be conceited; to brag; to show off
今日は僕がおごるから遠慮しないで。
I'll treat you today, so don't hold back.
成功しておごり高ぶるな。
Don't become arrogant just because you succeeded.
先輩が焼肉をおごってくれた。
The senior treated me to yakiniku.