Tā zài biànlùn zhōng qiánlǘjìqióng, zhǐhǎo chéngrèn shībài.
He ran out of tricks in the debate and had to admit defeat.
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history
This idiom comes from Liu Zongyuan's Tang dynasty essay 'The Donkey of Guizhou' (黔之驴). A donkey was brought to Guizhou (where no donkeys had existed), and a tiger feared it until it realized the donkey's only skill was kicking — then ate it.