n.[U]

1. 叛国罪，通敌罪；谋反罪
2. 叛国；背叛，不忠
   He was suspected of treason.

   他被怀疑有背叛行为。

   Deliberately broadcasting enemy propaganda to our troops is treason.

   故意向我军广播敌人的宣传是叛国行为。

n.

1. (also high treason) the crime of betraying one's country, especially by attempting to kill or overthrow the sovereign or government.
2. (petty treason) historical the crime of murdering a master or husband.