Say "Oh, my God!," say

GASP

Think of the sharp sound you might make when suddenly startled or shocked, like seeing a ghost. It’s a short, breathy exclamation.

This clue plays on the phrase "Oh, my God!" as something you might exclaim in shock, which often comes with a sharp intake of breath—a "gasp." The word "say" is used twice: first to hint at the exclamation itself, and second to suggest the answer is a synonym for that reaction. It’s a clever way to turn a common expression into a straightforward five-letter answer.