* Literal meaning (to move violently): The fish thrashed wildly on the hook before it was reeled in.
* Figurative meaning (to struggle or be agitated): The politician thrashed about for a way to answer the difficult question.
* Music: The band's thrash metal performance was intense and energetic.
* Informal: She thrashed her way through the homework, desperate to finish it before bedtime.
You can also use "thrash" as a noun, meaning a violent struggle:
* The argument turned into a full-blown thrash.
* The thrash of the waves against the rocks was deafening.