To join in an effort with others; cooperate.
Объединиться для совместных действий; взаимодействовать.
A is often good business to play ball with a political machine.
I am not going to play ball with you since your project is a mere fraud.
Я не собираюсь сотрудничать с вами, так как ваш проект это явное мошенничество.
To get along during Prohibition, many men felt that they had to play ball with gangsters.