Definitions for "Bivy"
short for "bivouac", a camping spot usually made in a pinch and for but one night; bivies are usually low on shelter and high on austerity. A bivy sack is a weatherproof sack of sleeping-bag proportions.
A place to spend the night. Sometimes a ledge on the side of a mountain
(n.) a place to spend the night. 2.(vb.) to spend the night, often in an unexpected location.