挺直腰板不服软天生傲骨不服输
[tĭng zhí yāo băn bù fú ruăn tiān shēng ào gú bù fú shū]
A longer iteration emphasizing both physical and metaphorical standing tall ('holding oneself straight') with natural arrogance ('proud bones') and an unwillingness to capitulate ('refusing to yield or soften'), symbolizing a strong-willed attitude facing challenges or opponents.