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to lose (something)
to get rid of; to eliminate; to remove; to eradicate; to abolish
よく物をなくすんだ。
I often lose things.
なくしたと思った本が机にあった。
The book I thought I lost was on the desk.
パスポートをなくさないようにカバンの奥に入れた。
I put my passport deep in my bag so I wouldn't lose it.