godan verb (-su), transitive verb
lose through death; be bereaved of
Used specifically for losing a close person such as a family member or friend through death. Not used for losing objects or abstract things; for those, use 無くす.
彼は若くして妻を亡くした。
He lost his wife at a young age.
戦争で多くの人が家族を亡くした。
Many people lost their families in the war.