“At a glance”

“A game changer”

Something that significantly changes a situation.

“At loggerheads”

In strong disagreement.

“A gray area”

A situation that is unclear or not clearly defined.

“A golden opportunity”

A very good chance to do something valuable.

“A losing battle”

A fight or effort that is unlikely to succeed.

“A fresh pair of eyes”

A new person who can look at something objectively.

“A long way off”

Far in the future or far from being ready.

“At full tilt”

As fast or strongly as possible.