(idiom) courtesy demands reciprocity; to treat others as they treat you, whether by returning favors or by paying them back in kind

never communicate or visit each other for a whole lifetime; describes a total lack of interaction or mutual interference between people even if they live close together

To have no dealings or social interaction with one another; to lead separate lives despite proximity.

A client with very poor credit standing who is denied banking services; a blacklisted account holder.

nongovernmental contact or exchange between people or groups

bank account from which money may be withdrawn without notice, such as a checking account or personal transactional account; current account

to come and go in a steady stream like weaving; busy with people or traffic