Declan

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The Japanese word

無くす

is pronounced
nakusu | なくす
means
lose
Examples:
大事な書類を無くすとはあなたも不注意でしたね。
daiji na shorui o nakusu to wa anata mo fuchūi deshi ta ne.
It was careless of you to lose the important documents.
Examples sourced from tatoeba.org