cash cow; gold mine; source of funds
Figurative expression for a person, product, or business that reliably generates a lot of money. Often used in business or entertainment contexts.
あのアイドルグループは事務所のドル箱だ。
That idol group is the agency's cash cow.
この
cash box; safe
Literal meaning: a box or safe for storing money. Less common than the figurative sense.
店長は売上金をドル箱に入れて金庫にしまった。
The store manager put the day's earnings into the cash box and locked it in the safe.
This product has become a gold mine for the company.
Rare ateji spelling using the kanji 弗 for 'dollar'. Not commonly used.
Compound of ドル (dollar) and 箱 (box). Originally referred to a box for storing dollar coins, then extended figuratively to mean a lucrative source of income.