to reach a point where one is physically or mentally exhausted and cannot continue
达到一个身体或精神上精疲力竭无法继续的点 (da dao yi ge shen ti huo jing shen shang jing pi li jie wu fa ji xu de dian)
"I’ve been working all day, and now I’ve finally hit the wall."
"我工作了一整天，现在终于撞墙了。" (wo gong zuo le yi zheng tian xian zai zhong yu zhuang qiang le)
to be involved in something too difficult to handle
a delicate situation requiring careful diplomacy
to admit something honestly
to make someone learn from their mistake
to have surgery
to hear gossip or rumor indirectly
