noun a marching back; retrocession.
2. countermarch ·noun a change of measures; alteration of conduct.
3. countermarch ·vi to march back, or to march in reversed order.
4. countermarch ·noun an evolution by which a body of troops change front or reverse the direction of march while retaining the same men in the front rank; also, a movement by which the rear rank becomes the front one, either with or without changing the right to the left.