a way of holding someone's arm from behind with both of your arms and holding their neck with your hands, so that it is difficult for them to move, used in wrestling (= a sport in which two people fight and try to throw each other to the ground)

He got his opponent in a tightly held full nelson. 他用一招双肩下握颈紧紧控制住对手。

a bad situation from which it is impossible to escape

He kept a full nelson on the staff by populating it with his political friends and relatives. 他把自己的政治朋友和亲戚充实到工作人员中，牢牢控制住局势。