to do something secretly or deceitfully against someone
偷偷或欺骗性地做某事，反对某人
"She went behind my back and told the manager everything."
"她在我背后告诉经理一切。"
to separate or end a relationship or marriage
a simple solution to a complex problem
to be in charge or control of a situation or organization
having sworn to tell the truth in court
to stay informed or at the same level as something or someon...
To lose a lot of money.
