Definition of "bivouac"

An encampment for the night, usually without tents or covering.  examples

Any temporary encampment.  examples

A temporary shelter constructed generally for a few nights.  quotations  examples

(dated) The watch of a whole army by night, when in danger of surprise or attack.  examples

(zoology) A structure formed by migratory ants out of their own bodies to protect the queen and larvae.

To set up camp.  quotations  examples

To watch at night or be on guard, as a whole army.  examples

To encamp for the night without tents or covering.  examples