This is the 7337th most frequent Japanese word.
亡くし
"亡くし" means "loss" or "to lose something (especially someone to death)."
Here, '亡くし' is used to indicate the act of losing someone dear due to their death, specifically in the context of bereavement.
彼は父を亡くしました。
He lost his father.
In this sentence, '亡くし' is metaphorically used to mean the loss of something valuable, in this case information.
彼女は重要な情報を亡くしてしまった。
She lost important information.
This sentence utilizes '亡くし' to describe the misplacement or loss of a physical object.