half nelson: a wrestling hold in which the holder puts an arm under the opponent's arm and exerts pressure on the back of the neck
nelson: any of several wrestling holds in which an arm is passed under the opponent's arm from behind and the hand exerts pressure on the back of the neck
lexeme: a minimal unit (as a word or stem) in the lexicon of a language; `go' and `went' and `gone' and `going' are all members of the English lexeme `go'