horseback opinion

English

Noun

horseback opinion (plural horseback opinions)

  1. (informal, idiomatic) An opinion given without thorough consideration or a firm basis, often used in a casual or speculative way.
    • 1903, Andy Adams, The Log of a Cowboy, A Narrative of the Old Trail Days, page 72:
      My sister gives it as a horseback opinion that she'd been engaged to this fellow nearly eight months.