“Behind the times”

“A gray area”

A situation that is unclear or not clearly defined.

“A golden opportunity”

A very good chance to do something valuable.

“A close shave”

A situation where danger or failure was narrowly avoided.

“Nothing to write home about”

Not special or impressive.

“Behind closed doors”

Privately, not in public.

“A level head”

Calm and sensible thinking.

“Nail down”

To finalize or clearly define something.

“A hidden gem”

Something excellent but not widely known.