Source : Webster's Revised Unabridged Dictionary (1913)

Zigzag \Zig"zag`\, v. t. [imp. & p. p. {Zigzagged}; p. pr. & vb.
   n. {Zigzagging}.]
   To form with short turns.

Source : WordNet®

zigzag
     adj : having short sharp turns or angles
     [also: {zigzagging}, {zigzagged}]

zigzag
     n : an angular shape characterized by sharp turns in alternating
         directions [syn: {zig}, {zag}]
     adv : in a zigzag course or on a zigzag path; "birds flew zigzag
           across the blue sky"
     v : travel along a zigzag path; "The river zigzags through the
         countryside" [syn: {crank}]
     [also: {zigzagging}, {zigzagged}]

zigzagging
     See {zigzag}