看尽落叶萧瑟饮尽手中苦涩
[kàn jĭn luò yè xiāo sè yĭn jĭn shŏu zhōng kŭ sè]
This suggests experiencing all sorts of vicissitudes in life and enduring bitterness and suffering alone. It depicts someone who has witnessed a lot of partings or seen many disappointments; meanwhile, drinking 'bitterness' signifies swallowing grievance by oneself, highlighting both physical and spiritual fatigue.