Definition of setback noun from the Oxford Advanced Learner's Dictionary

 

setback

 noun
noun
BrE BrE//ˈsetbæk//
 
; NAmE NAmE//ˈsetbæk//
 
 
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a difficulty or problem that delays or prevents something, or makes a situation worse The team suffered a major setback when their best player was injured. The breakdown in talks represents a temporary setback in the peace process.Extra examples That would represent a huge setback in the fight to change our criminal justice system. a further setback for the coal industry a serious setback to his chances of re-election Don’t be put off by any early setbacks. The breakdown in talks represents a temporary setback in the peace talks.
See the Oxford Advanced American Dictionary entry: setback