thrashes

/TH R AE1 SH IH0 Z/
noun
  1. 1

    A beat or blow; the sound of beating.

  2. 2

    Thrash metal

verb
  1. 1

    To beat mercilessly.

  2. 2

    To defeat utterly.

  3. 3

    To thresh.

  4. 4

    To move about wildly or violently; to flail; to labour.

  5. 5

    To extensively test a software system, giving a program various inputs and observing the behavior and outputs that result.

  6. 6

    In computer architecture, to cause poor performance of a virtual memory (or paging) system.

Source: https://en.wiktionary.org/wiki/thrash, https://en.wiktionary.org/wiki/thrashes