play hardball
To use every means possible to achieve a goal, especially in disregarding the harm caused.
He was more than willing to extend the terms of the loan, but his boss decided to play hardball and demanded a balloon payment.
noun
In baseball, a type of ball and baseball game, as opposed to softball.
Tough or ruthless behavior, especially in combat, politics or business.
adj
Being or exhibiting tough or ruthless behavior, especially in combat, politics or business.
verb
To exhibit tough and ruthless behavior towards another individual.