분실해요 · 분실했어요 · 분실할 거예요 · 분실한 (+noun)
to lose (an item)
Example
카드를 분실하면 바로 은행에 신고하세요.
If you lose your card, report it to the bank right away.
Word parts
분 scattered+실 lose
Literally 'let it scatter and lose it'.
Good to know
More formal than 잃어버리다; you'll see it on official notices, forms and in banks.
Related words