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なくなる， 無くなる
1. to be lost (e.g. luggage), to be missing
2. to be used up, to be run out, to be exhausted, to be consumed, to be reduced to zero, to not occur any more
3. to disappear (e.g. pain), to be lost (e.g. a dream, confidence)
丢失（如行李），失踪；用完，耗尽；消失，迷失