The idiom "on the ball" means being alert, aware, or attentive. It suggests that someone is always ready for anything, and they're in control of their actions and decisions. This phrase can also mean being organized, efficient, and professional in one's work or business dealings.

The idiom "pour oil on troubled waters" means to make a situation worse by causing unnecessary drama or chaos. It suggests adding fuel to a fire or pouring more oil onto already turbulent waters, which can only worsen the situation.

The idiom "hard cheese" is used to express disbelief or shock when someone says something that you find unacceptable or offensive. It can also be used to express disappointment or frustration when someone does not fulfill your expectations.

The idiom "pep talk" is a motivational speech or conversation that is meant to inspire, encourage, and give confidence to someone who is feeling down, depressed, or demotivated.

The idiom "it’s better to be safe than sorry" means that it is better to take precautions or take action to avoid negative consequences, rather than waiting and regretting not taking action after the fact. It emphasizes caution and foresight, rather than relying on luck or chance.