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to abandon; to give up on; to desert
先生は勉強しない生徒を遂に見放した。
The teacher finally gave up on the student who refused to study.
友達は彼を見放して去った。
His friends gave up on him and left.
その医者はどんなに困難な患者でも見放すことはない。
That doctor never gives up on any patient, no matter how difficult their case.