那日我折尽长安的柳
[nèi rì wŏ zhé jĭn zhăng ān de liŭ]
On That Day I Picked All the Willows of Chang'an (ancient capital city). A poetic phrase expressing a momentous day when something precious has been lost or ended completely, possibly referring to farewell with deep sentiment, inspired by traditional parting customs involving giving someone willow branches.