n.[U]

1. 叛國罪，通敵罪；謀反罪
2. 叛國；背叛，不忠
   He was suspected of treason.

   他被懷疑有叛國行為。

   Deliberately broadcasting enemy propaganda to our troops is treason.

   故意向我軍廣播敵人的宣傳是叛國行為。

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.