Tā mà zìjǐ shì ge ruǎngǔtou, guānjiàn shíkè bù gǎn zhàn chūlái.
He cursed himself as a coward who didn't dare to step up at the critical moment.
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Literally 'soft bone' - a vivid parallel to English 'spineless'. Both languages reach for the same image of a person whose skeleton can't hold them upright when pressure comes.
