“The tip of the iceberg”

“A matter of time”

Something that will certainly happen eventually.

“A fresh pair of eyes”

A new person who can look at something objectively.

“Draw the short straw”

To be chosen for an unpleasant task.

“Even the score”

To make a situation equal after being behind.

“Can’t make head or tail of”

To be unable to understand something.

“Not my cup of tea”

Not something one likes or enjoys.

“Full of beans”

Energetic and lively.

“Blow things out of proportion”

To make something seem much worse than it is.