- To produce no effect; to fail in the intended effect.
- The politician's speech fell flat.
- Lord Erskine
- Of all who fell by saber or by shot, / Not one fell half so flat as Walter Scott.
- 2012 May 13, Alistair Magowan, “Sunderland 0-1 Man Utd”, in BBC Sport:
- United were made to pay for letting an eight-point lead as little as five weeks ago slip and, despite their final-day efforts, they will look back on a season where, when they needed to step up, they fell flat.