to hit rock bottom or to reach rock bottom
1.prices +降到最低点；到达最低水平
Prices have hit rock bottom.物价已经降到最低点了。
2.person +遇到极度困难；状态极度糟糕
Until they reach rock bottom, people cannot get financial help.未到极度困难时, 人们是得不到经济帮助的。
3.morale +极度低落
Her spirits reached rock bottom.她情绪低落到了谷底。
His confidence hit rock bottom.他彻底失去了信心。