The phrase "hard bargain" means tough or difficult negotiations where someone tries to get the best deal possible, often using strong tactics. Full definition
When asked about expected starting salaries, students aren't driving hard bargains. (moneysense.ca)
This will not come about by a European directive, but through hard bargaining among different economic and political actors working under pressure from internal and external shocks. (blog.politics.ox.ac.uk)
As negotiations progress, the parties give ground only gradually, while trying to wear down the other side with hard bargaining tactics, e.g., threatening to walk out. (divorcesource.com)