“Cost a fortune”

“Save face”

To avoid embarrassment or loss of respect.

“Read between the lines”

To understand the hidden meaning of something.

“Smell a rat”

To suspect that something is wrong or dishonest.

“Rock the boat”

To cause problems by changing or challenging the situation.

“Out of your depth”

In a situation that is too difficult for your knowledge or ability.

“Start from scratch”

To begin again from the very beginning.

“Take the plunge”

To decide to do something important or risky.

“Sit tight”

To wait patiently and not take action yet.