Dictionary / Vocabulary / 驕る
おごる
to be proud; to be haughty; to be arrogant; to be conceited
Also written 傲る
君の実力なら楽勝だとは思うが、それに驕らず、まずはクラスのみんなと切磋琢磨していって欲しい。
With your ability it should be a doddle, but please don't get too big for your boots: apply yourself diligently like everyone in your class.
驕れる者は久しからず。
Pride goes before a fall.
驕る平家は久しからず。
Pride will have a fall.