It seems it is well established terminology relating to bank account and reporting. It is not just a badly translated description of owing a home.
Search "hold mail or in care of address" for lots of information, for example from HMRC (UK) below;
For FATCA purposes
If any in-care-of address or a hold mail instruction is discovered in the enhanced review of High Value Accounts, and no other address or indicia of residence are identified for the Account Holder, the Financial Institution must treat this as U.S. indicia and therefore as a U.S. Reportable Account unless it obtains a self-certification or other documentary evidence from the Account Holder to establish that the Account Holder is not a U.S. citizen or resident in the U.S. for tax purposes.