What is the meaning of Thrash?

To beat mercilessly.

To defeat utterly.

To thresh.

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

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

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

A beat or blow; the sound of beating.

Ellipsis of thrash metal.

thrash metal, thrash

rush

Source: wiktionary.org