訓 みと(める) ・ 音 ニン
Sino-Vietnamese: nhận
Words 言 for meaning, 忍 (endure) for the sound nin. You swallow your pride, then say the words that admit it. Hence kakunin (confirm) and shounin (approval).
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彼は失敗を認めました。 (かれはしっぱいをみとめました)
He admitted his mistake.