What does the word lather mean?

Usage examples for lather

  1. Frequently she vented her spite upon her horse, and more than once she brought it home with its mouth bleeding and its flanks white with lather. – Flowing Gold by Rex Beach
  2. She came up to the Sawtooth ranch- houses with Snake in a lather of sweat and with her own determination unweakened to carry the war into the camp of her enemy. – Sawtooth Ranch by B. M. Bower
  3. A good lather is applied all over the body with good friction by the means of a shampoo brush and soap. – The Mother and Her Child by William S. Sadler Lena K. Sadler