“Eat your words”

“Eat humble pie”

To admit that you were wrong.

“Have eyes bigger than your stomach”

To take or want more food than you can eat.

“In a nutshell”

In a very brief and clear way.

“A wild goose chase”

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

“Hold your own”

To perform well despite difficulty or competition.

“Hang in there”

To keep trying and not give up.

“Take a rain check”

To postpone an invitation or plan for another time.

“Find your feet”

To become comfortable in a new situation.