To fall flat Meaning, Definition & Usage

Definitions
  1. (Fig.), to produce no effect; to fail in the intended effect; as, his speech fell flat.
    Of all who fell by saber or by shot, Not one fell half so flat as Walter Scott. Lord Erskine.
Definitions
  1. to produce no response or result; to fail of the intended effect; as, his speech fell flat.

Webster 1913