blunder
A clumsy or embarrassing mistake. / (chess) A very bad move, usually caused by some tactical oversight.
(mineralogy) Pertaining to phosphorite; resembling, or of the nature of, phosphorite.
(organic chemistry) acyl
An American butterfly, Polygonia interrogationis, whose wings are mottled with various shades of red and brown and have violet tips.
プレゼンテーション中にプロジェクターのカバーを付けたままにしてしまったのは、とても恥ずかしい大失敗だった。
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