not long for this world; soon to die

expression of total disappointment or despair, similar to "that is the end of it" or "forget it"

(idiom) what is past is gone; let bygones be bygones

if one hears the way in the morning, one can die without regret in the evening; a Confucian teaching emphasizing the supreme value of understanding the truth or the right path

If one learns the truth in the morning, one can die without regret in the evening; expresses a passionate and urgent pursuit of the truth or a righteous path.

To stare from behind after being outpaced; used to describe being left far behind and unable to catch up.