"Divide and conquer" is an idiom that means to divide a problem or task into smaller parts and then solve each part individually. This approach can be used to tackle complex tasks by breaking them down into more manageable ones.

"Foot the bill" means to pay for something, usually a large amount of money, often without being asked to do so or expecting reimbursement. It can also mean to take responsibility for an action or decision, or to be held accountable for one's mistakes.

The idiom "come to a head" means that a situation or problem has reached its peak, culminated, or reached its logical conclusion. It can also mean that a confrontation or conflict has escalated to the point of resolution or decision-making.

The idiom "I'll eat my hat" is used to express shock, surprise, or disbelief. It means that the speaker will do something extremely unlikely if a certain condition is met. For example:

• "If you win the lottery, I'll eat my hat.

The idiom "chattering classes" refers to a group of people who like to talk or gossip about various topics, often in social settings.