“Fair and square”

“A wild goose chase”

A useless search for something that is hard or impossible to find.

“In black and white”

Written or printed clearly.

“Back to square one”

To start again from the beginning after failing.

“Hang in there”

To keep trying and not give up.

“Take a rain check”

To postpone an invitation or plan for another time.

“Cut someone some slack”

To be less critical of someone.

“High and dry”

Left without help or support.

“Rule of thumb”

A simple practical rule based on experience.