The Collaborative International Dictionary of English v.0.48:

Ambush \Am"bush\ ([a^]m"b[oo^]sh), v. t. [imp. & p. p.
   Ambushed ([a^]m"b[oo^]shd); p. pr. & vb. n. Ambushing.]
   [OE. enbussen, enbushen, OF. embushier, embuissier, F.
   emb[^u]cher, embusquer, fr. LL. imboscare; in + LL. boscus,
   buscus, a wood; akin to G. bush, E. bush. See Ambuscade,
   Bush.]
   1. To station in ambush with a view to surprise an enemy.
      [1913 Webster]

            By ambushed men behind their temple laid,
            We have the king of Mexico betrayed.  --Dryden.
      [1913 Webster]

   2. To attack by ambush; to waylay.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ambush \Am"bush\, v. i.
   To lie in wait, for the purpose of attacking by surprise; to
   lurk.
   [1913 Webster]

         Nor saw the snake that ambushed for his prey.
                                                  --Trumbull.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ambush \Am"bush\ ([a^]m"b[oo^]sh), n. [F. emb[^u]che, fr. the
   verb. See Ambush, v. t.]
   1. A disposition or arrangement of troops for attacking an
      enemy unexpectedly from a concealed station. Hence: Unseen
      peril; a device to entrap; a snare.
      [1913 Webster]

            Heaven, whose high walls fear no assault or siege
            Or ambush from the deep.              --Milton.
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   2. A concealed station, where troops or enemies lie in wait
      to attack by surprise.
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            Bold in close ambush, base in open field. --Dryden.
      [1913 Webster]

   3. The troops posted in a concealed place, for attacking by
      surprise; liers in wait. [Obs.]
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            The ambush arose quickly out of their place. --Josh.
                                                  viii. 19.
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   To lay an ambush, to post a force in ambush.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ambush
    n 1: the act of concealing yourself and lying in wait to attack
         by surprise [syn: ambush, ambuscade, lying in wait,
         trap]
    v 1: wait in hiding to attack [syn: ambush, scupper,
         bushwhack, waylay, lurk, ambuscade, lie in wait]
    2: hunt (quarry) by stalking and ambushing [syn: still-hunt,
       ambush]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "ambush":
   ambuscade, ambushment, assail, assault, astonish, attack, blind,
   blitz, booby trap, bushwhack, catch off-guard, catch unawares,
   come at, come down on, come from behind, come upon unexpectedly,
   cover, crack down on, descend on, descend upon, do the unexpected,
   drop in on, ensnare, entrap, fall on, fall upon, gang up on, go at,
   go for, harry, have at, hideout, hit, hit like lightning,
   intercept, jump, land on, lay at, lay for, lay hands on, lay into,
   lay wait for, lie in ambush, lie in wait, light into, lure, lurk,
   lurking hole, mug, pitch into, pounce upon, pound, pull up short,
   retreat, sail into, set on, set upon, shadowing, snare,
   spring a surprise, spring upon, stalking-horse, strike, surprise,
   surveillance, swoop down on, take by surprise, take short,
   take the offensive, take unawares, trap, wade into, waylay



The Free On-line Dictionary of Computing (30 December 2018):

AMBUSH

    A language for linear programming problems in a
   materials processing and transportation network.

   ["AMBUSH - An Advanced Model Builder for Linear Programming",
   T.R. White et al, National Petroleum Refiners Assoc Comp Conf
   (Nov 1971)].

   (1995-06-19)


Easton's 1897 Bible Dictionary:

Ambush
   Joshua at the capture of Ai lay in ambush, and so deceived the
   inhabitants that he gained an easy victory (Josh. 8:4-26).
   Shechem was taken in this manner (Judg. 9:30-45. Comp. Jer.
   51:12).