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To deter an enemy from approaching close to the lines or fortifications, by inducing him to suspect a superior force, an ambuscade, or a mine. the Field. To comers. continue a campaign; to maintain one's ground against— all Keep Up. — In military movements, to preserve that regular pace by which a line or column on a march, or in maneuvering, advances towards any given point without any fluctuations; to keep up a heavy fire is to play heavy ordnance against a fortified place or body of men.