Where does “trash” come from?

Trash comes from Middle English trasch, which derives from Middle English trass, ultimately from Old Norse tros.

trash (English): Useless things to be discarded; rubbish; refuse;...

Definitions

Step	Language	Word	Meaning
1	Middle English	trasch	Refuse or rubbish, especially that composed of...
2	Old Norse	tros	rubbish, fallen leaves and twigs; brittle branch