Merriam-Webster Collegiate Dictionary - slalom

 I. noun  Usage: often attributive  Etymology: Norwegian slalam, literally, sloping track  Date: 1921  1. skiing in a zigzag or wavy course between upright obstacles (as flags)  2. a timed race (as on skis or in an automobile or kayak) over a winding or zigzag course past a series of flags or markers; broadly movement over a zigzag route  II. intransitive verb  Date: 1932 to move over a zigzag course in or as if in a ~