D defs.my
Entry 2 senses · 2 variants Webster, 1913

Bivouac

/bĭv'-wăk/ · Biv·ouac · IPA /ˈbɪv.u.æk/
01 n. The watch of a whole army by night, when in danger of surprise or attack.
  1. 1.
    The watch of a whole army by night, when in danger of surprise or attack.(Mil.)
02 v. i. To watch at night or be on guard, as a whole army.
imp. & p. p. Bivouacked; p. pr. & vb. n. Bivouacking
  1. 1.
    To watch at night or be on guard, as a whole army.(Mil.)