- 不堪回首 bùkānhuíshǒu unbearable to recallcannot bear to look back on or recall past events; too painful to think about
- 一失足成千古恨，再回首已百年身 yīshīzúchéngqiāngǔhènzàihuíshǒuyǐbǎiniánshēn a single slip brings eternal regret and by the time one looks back a lifetime has passeda single misstep results in lifelong remorse, and by the time one realizes the mistake, one's life is already over; emphasizes the irreversible nature of serious mistakes
- 蓦然回首 mòránhuíshǒu to suddenly look backTo suddenly turn one's head; to look back abruptly
