Etymology

Verb

1. 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.

   I was wondering when he would man up and marry that girl he knocked up.

   You need to man up and confront your boss about his behavior.

   Hey son, man up, ok? There will be time for tears later.

2. (of military personnel in a unit) to assemble, each person manning (attending to) his station, prepared for departure of an aircraft, ship, etc.
3. (of personnel, industrial, etc.) to staff adequately; to staff up; to successfully fill all needed labor positions.

Usage notes

• The staffing use has become outdated, preferring instead staff up, while politically correct society no longer favors referring to "manpower", "manning" a position, etc.