讨价还价 (tǎo jià huán jià): Bargain/barter with somebody for something — Meaning & Stroke Order

At the market, customers often bargain with vendors.

Despite the tight schedule, they are still fiercely bargaining over the details of the contract.

Don't you think bargaining over matters of principle is undignified?

He never bargains with anyone, always giving his final offer directly.