“Out of the blue”

“Draw a blank”

To fail to remember or find an answer.

“Fall flat”

To fail to have the intended effect.

“Iron out”

To solve small problems or disagreements.

“Fine line”

A small difference between two things.

“First things first”

The most important things should be done first.

“Carve out a niche”

To create a specific position in a market or field.

“Fill the gap”

To provide what is missing.

“Burn out”

To become exhausted from too much work or stress.