A transitive verb meaning to lose someone through death (e.g., to lose a spouse or child). Used for people who die.
彼は若くして妻を亡くした。
He lost his wife at a young age.
事故で友人を亡くして、しばらく立ち直れなかった。
After losing a friend in an accident, I couldn't recover for a while.
祖母を亡くしたとき、家族みんなで集まった。
When we lost our grandmother, the whole family gathered.