Literally: knife.

The knife came to Navajo people alongside the introduction of forged metals, so you’ll often see béésh in phrases that involve other metal objects.

If metal is a core component, it is combined with other characteristics of a particular object. For example, technology-related things like telephones, tvs, radios, stoves, train tracks, etc., use béésh to distinguish their metallic nature.

So, used on its own, it simply means knife.