The difference between Belly up to the bar and Man up
When used as verbs, belly up to the bar means to commit oneself to a challenge or task, whereas man up means to "be a man about it".
check bellow for the other definitions of Belly up to the bar and Man up
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Belly up to the bar as a verb (chiefly, US, idiomatic):
To commit oneself to a challenge or task; to accept a responsibility; to acknowledge a fact.
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Man up as a verb (idiomatic):
To "be a man about it"; to do the things a 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. .}}
Examples:
"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."
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Man up as a verb (of military personnel):
To assemble, each person manning (attending to) his station, prepared for the departure of an aircraft, ship, etc. .}}
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Man up as a verb (of other personnel):
To staff adequately; to staff up; to successfully fill all needed labor positions. .}}
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Man up as a verb (sports):
To vigorously guard the opponent to which one is assigned.