Source : Webster's Revised Unabridged Dictionary (1913)

Stagger \Stag"ger\, v. t.
   1. To cause to reel or totter.

            That hand shall burn in never-quenching fire That
            staggers thus my person.              --Shak.

   2. To cause to doubt and waver; to make to hesitate; to make
      less steady or confident; to shock.

            Whosoever will read the story of this war will find
            himself much stagered.                --Howell.

            Grants to the house of Russell were so enormous, as
            not only to outrage economy, but even to stagger
            credibility.                          --Burke.

   3. To arrange (a series of parts) on each side of a median
      line alternately, as the spokes of a wheel or the rivets
      of a boiler seam.

Stagger \Stag"ger\, v. i. [imp. & p. p. {Staggered}; p. pr. &
   vb. n. {Staggering}.] [OE. stakeren, Icel. stakra to push, to
   stagger, fr. staka to punt, push, stagger; cf. OD. staggeren
   to stagger. Cf. {Stake}, n.]
   1. To move to one side and the other, as if about to fall, in
      standing or walking; not to stand or walk with steadiness;
      to sway; to reel or totter.

            Deep was the wound; he staggered with the blow.
                                                  --Dryden.

   2. To cease to stand firm; to begin to give way; to fail.
      ``The enemy staggers.'' --Addison.

   3. To begin to doubt and waver in purposes; to become less
      confident or determined; to hesitate.

            He [Abraham] staggered not at the promise of God
            through unbelief.                     --Rom. iv. 20.

Stagger \Stag"ger\, n.
   1. An unsteady movement of the body in walking or standing,
      as if one were about to fall; a reeling motion; vertigo;
      -- often in the plural; as, the stagger of a drunken man.

   2. pl. (Far.) A disease of horses and other animals, attended
      by reeling, unsteady gait or sudden falling; as, parasitic
      staggers; appopletic or sleepy staggers.

   3. pl. Bewilderment; perplexity. [R.] --Shak.

   {Stomach staggers} (Far.), distention of the stomach with
      food or gas, resulting in indigestion, frequently in
      death.

Source : WordNet®

stagger
     n : an unsteady uneven gait [syn: {lurch}, {stumble}]

stagger
     v 1: walk as if unable to control one's movements; "The drunken
          man staggered into the room" [syn: {reel}, {keel}, {lurch},
           {swag}, {careen}]
     2: walk with great difficulty; "He staggered along in the heavy
        snow" [syn: {flounder}]
     3: to arrange in a systematic order; "stagger the chairs in the
        lecture hall" [syn: {distribute}]
     4: astound or overwhelm, as with shock; "She was staggered with
        bills after she tried to rebuild her house following the
        earthquake"