I don't know; I have no idea. Suggests the questioner could search thoroughly and find no answer.
Examples:
- Where's John?—Search me. I haven't seen him for weeks.
Origin: c. 1900
Synonyms: beats me, don
I don't know; I have no idea. Suggests the questioner could search thoroughly and find no answer.
Examples:
Origin: c. 1900
Synonyms: beats me, don