Bush"whack`ing, n. 1. Traveling, or working a way, through bushes; pulling by the bushes, as in hauling a boat along the bushy margin of a stream. [U.S.] T. Flint.

2. The crimes or warfare of bushwhackers. [U.S.]

• travelling through thick wooded country, cutting away scrub to make progress
  
• fighting, as a guerilla, especially in wooded country