means A structure or refuge that protects from weather, danger, or hardship — or the act of providing such protection.

from From Middle English, with the second half likely from Old English 'truma,' meaning a troop or body of men — so an early sense may have been a shield-wall, men packed together as a defensive cover. The exact path is debated, but the image endures: shelter as bodies and barriers thrown up against threat. By the 1500s the word had broadened from human cover to any place of refuge from the elements.