Merriam-Webster Collegiate Dictionary - zig

 I. noun  Etymology: ~zag  Date: 1840  1.  a. one of the sharp turns, angles, or alterations in a ~zag course  b. one of the short straight lines or sections of a ~zag course at an angle to a zag  2. a sharp alteration or change of direction (as in a process or policy) the quick ~s and zags of his international maneuverings — New York Times  II. intransitive verb  (~ged; ~ging)  Date: 1940 to execute a ~ — usually contrasted with zag ~s when others zag