broken-field definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Football, Rugby of or having to do with running in which the ball carrier zigzags so as to go past defenders and avoid being tackled by them
broken-field definition by American Heritage Dictionary
Accomplished by a ball carrier against opposition that is widely scattered over the field: broken-field running.