Walking with a regular, measured step, often in a group or military formation; progress toward something.
From Old French 'marche' meaning 'boundary' or 'march,' then to 'walk along a boundary.' Later the military usage, walking in step, became dominant.
Military marching in synchronized step was designed so soldiers could break down walls—the rhythm and timing meant coordinated force rather than random impacts, which is why breaking stride was sabotage.
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