fight to the finish

Từ điển Oxford Advanced Learner 8th

▪ I. a fight to the ˈfinish idiom
a sports competition, election, etc. between sides that are so equal in ability that they continue fighting very hard until the end
•Six teams are bitter rivals in what will be a fight to the finish.
Main entry: ↑fight_idiom
 
▪ II. fight to the ˈdeath/ˈfinish f20 idiom
to fight until one of the two people or groups is dead, or until one person or group defeats the other
Main entry: ↑fight_idiom