[, ]the action of putting important documents or valuable items in a strong room or metal box, for example in a bank, to keep them safe; a place that offers this service （银行等的）保管箱业务，保管箱租赁处◆items on safe deposit at the bank 存放在银行保管箱中的物品◆a safe-deposit box/vault 保管箱；保管库◆The bank has a safe-deposit service. 该银行提供保管箱服务。