You look like you've seen a ghost

Meaning

Said to someone who has suddenly turned very pale or appears visibly shocked. It implies the person has had a massive fright.

Concerned, observant

Used in a sentence

• Sit down and drink some water because you look like you have seen a ghost.
• Did you get some bad news at the office? You look like you have seen a ghost.
• He walked through the door looking like he had seen a ghost.