Man up

[Britney]

to fulfill your responsibilites as a man, despite your insecurities and constant ability to place yourself in embarrasing and un-manly scenarios.

[Donald Trump]

Be strong

[Donald Trump]

-Verb-

1.) forget about your problem(s) because you were born with a penis, therefore it is not important to anyone that you have any problem(s)

2.) take a risk that you know is against your own interests because someone else thinks you should based on the fact that cannot carry a child to term you disposable motherfucker

3.) be silent and accept your suffering because you have testicles

4.) earn your worth because you dont have a womb and your sperm is dime a dozen.

[Britney]

To work through impediments and obstacles without whining

[Tina]

Man up can also mean for an individual to be (not act) mature, to grow up, quit being childish, to change their ways and turn around (do a 180) and to go the correct way from now on, etc...

Close to that: man up can also mean for someone to stop being self-centered and to look at what they are doing, or how they are acting - for them to change viewpoints, and perspective on the situation(s) and move forward in the correct direction in their life, and/or in others lives.

Man up can also mean for one to be a leader, to step up to the plate when no one else will, to give it your best shot, to TRY!

[Dave Paprocki]

used to tell someone that they should deal with something more bravely: