"Don't hang up" 或 "Don't hang the phone up" 是告诫对方不要挂断电话的常用说法。
来源："Hang up" 是挂断电话的意思，而 "Don't" 是否定形式，加在 "hang up" 前面就成了不要挂断电话的意思。
例句：
Don't hang up, I haven't finished talking yet. (别挂电话，我还没说完。)
Can you please not hang up the phone? I need to ask you something. (你能不挂电话吗？我还有事问你。)
Don't hang up! I'll transfer you to the right department. (别挂电话，我会把你转给正确的部门。)