fight it out
To struggle on until the end
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Main Entry: ↑fight
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settle a dispute by fighting or competing aggressively
they fought it out with a tug-of-war
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fight it out
1 : to be in a fight
People were fighting it out over parking spaces.
2 : to end a dispute by fighting or arguing
This matter won't be settled until the lawyers fight it out in court.
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Main Entry: ↑fight
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ˌfight ˈout sth | ˌfight it ˈout derived
to fight or argue until an argument has been settled
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The conflict is still being fought out.
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They hadn't reached any agreement so we left them to fight it out.
Useful english dictionary. 2012.