The difference between Fight and Punch-up
When used as nouns, fight means an occasion of fighting, whereas punch-up means a fight with the fists.
Fight is also verb with the meaning: to contend in physical conflict, either singly or in war, battle etc.
check bellow for the other definitions of Fight and Punch-up
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Fight as a verb (intransitive):
To contend in physical conflict, either singly or in war, battle etc.
Examples:
"A wounded animal will fight like a maniac, relentless, savage and murderous."
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Fight as a verb (reciprocal):
To contend in physical conflict with each other, either singly or in war, battle etc.
Examples:
"The two boxers have been fighting for more than half an hour."
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Fight as a verb (intransitive):
To strive for; to campaign or contend for success.
Examples:
"He fought for the Democrats in the last election."
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Fight as a verb (transitive):
To conduct or engage in (battle, warfare etc.).
Examples:
"The battle was fought just over that hill."
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Fight as a verb (transitive):
To engage in combat with; to oppose physically, to contest with.
Examples:
"My grandfather fought the Nazis in World War II."
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Fight as a verb (transitive):
To try to overpower; to fiercely counteract.
Examples:
"The government pledged to fight corruption."
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Fight as a verb (transitive, archaic):
To cause to fight; to manage or manoeuvre in a fight.
Examples:
"to fight cocks;  to fight one's ship"
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Fight as a noun:
An occasion of fighting.
Examples:
"One of them got stuck in a chokehold and got stabbed to death during the fight."
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Fight as a noun (archaic):
A battle between opposing armies.
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Fight as a noun:
A physical confrontation or combat between two or more people or groups.
Examples:
"Watch your language, are you looking for a fight?"
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Fight as a noun (sports):
A boxing or martial arts match.
Examples:
"I'm going to Nick’s to watch the big fight tomorrow night."
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Fight as a noun:
A conflict, possibly nonphysical, with opposing ideas or forces; strife.
Examples:
"I'll put up a fight to save this company."
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Fight as a noun (uncountable):
The will or ability to fight.
Examples:
"That little guy has a bit of fight in him after all. As soon as he saw the size of his opponent, all the fight went out of him."
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Fight as a noun (obsolete):
A screen for the combatants in ships.
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Punch-up as a noun (informal):
A fight with the fists.