隠し口座

かくしこうざ【隠し口座】

a secret (bank) account.

●あの政治家は国外の銀行に複数の隠し口座を持っているらしい. Apparently that politician has a number of secret accounts in banks abroad.

●捜査当局はついに隠し口座への入金を突き止めた. Investigators have finally pinpointed the flow of money into a secret account.