Present participle: the action of marching in the opposite direction or reversing a marching formation's direction.
Present participle of 'countermarch,' formed with '-ing' suffix. Military drill terminology used since at least the 16th century in formal drilling manuals.
Marching bands and color guards perform countermarching at halftime shows and parades—it looks smooth but requires millisecond timing. It's one of the hardest parts of drill team competitions!
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