v (idiomatic) to "be a man about it"; to do the things a good man is traditionally expected to do, such as: taking responsibility for the consequences of one's actions; displaying bravery or toughness in the face of adversity; providing for one's family, etc.
v (idiomatic) (of military personnel in a unit) to assemble, each person manning (attending to) his station, prepared for departure of an aircraft, ship, etc.
v (idiomatic) (of personnel, industrial, etc.) to staff adequately; to staff up; to successfully fill all needed labor positions.
v (sports) to vigorously guard the opponent to which one is assigned