'Half nelson' definitions:

Definition of 'half nelson'

(from WordNet)
noun
A wrestling hold in which the holder puts an arm under the opponent's arm and exerts pressure on the back of the neck

Definition of 'Half nelson'

From: GCIDE
  • Half nelson \Half nelson\ (Wrestling) A hold in which one arm is thrust under the corresponding arm of the opponent, generally behind, and the hand placed upon the back of his neck. In the
  • full nelson both hands are so placed. [Webster 1913 Suppl.]