defeat
noun
an unsuccessful ending to a struggle or contest
“it was a narrow defeat”
“the army's only defeat”
SynonymslickingOppositesvictorythe feeling that accompanies an experience of being thwarted in attaining your goals
Synonymsfrustration
verb
win a victory over
“You must overcome all difficulties”
“defeat your enemies”
thwart the passage of
“kill a motion”
“he shot down the student's proposal”
Source: WordNet 3.1, Princeton University