be unwilling to acknowledge defeat
Refused to concede defeat » 不肯认输 the police went through the house carefully but they found no evidence that would help them.
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当然喽，我是绝不肯认输的。
Well, of course, I hated to give it up.
youdao
在他面前，我总不肯认输。
In front of him, I always refused to admit defeat.
虽然他们已遭受惨重损失，但还是不肯认输。
Although they had suffered heavy losses, they refused to concede defeat.
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