at a guess

at a guess

1. (informal) Judged by cursory examination; at a glance.
   • 1934, Agatha Christie, chapter 3, in Murder on the Orient Express, London: HarperCollins, published 2017, page 27:

     The woman opposite him was a mere girl — twenty at a guess.

• “at a guess”, in Collins English Dictionary.
• “at a guess” (US) / “at a guess” (UK) in Macmillan English Dictionary.