To march or walk laboriously for a long distance, especially in military contexts or when tired.
From foot + slog, where slog likely comes from an onomatopoetic or dialect word meaning to walk heavily. Popularized in military usage during WWI.
WWI soldiers called long, exhausting marches 'footslogging'—the term captured the monotonous, grueling reality of trench warfare where soldiers spent as much time marching as fighting.
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