“Big fish in a small pond”

“Cast in stone”

Fixed and impossible to change.

“Follow in someone’s footsteps”

To do the same thing as someone did before you.

“In full swing”

Happening with full activity and energy.

“Go down in flames”

To fail completely and dramatically.

“A storm in a teacup”

A lot of anger or worry about something unimportant.

“Go in circles”

To make no progress while repeating the same ideas or actions.

“In a pickle”

In a difficult or troublesome situation.

“Feather in your cap”

An achievement you can be proud of.