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Wiktionary
string up

vb. 1 (context transitive idiomatic English) To kill (a person) by hanging, especially to lynch. 2 (context intransitive idiomatic obsolete English) To die by hanging. 3 (context transitive idiomatic English) To suspend by means of rope, cord or similar material. 4 (context transitive idiomatic English) To concatenate; to link in a line.

WordNet
string up
  1. v. kill by hanging; "The murdered was hanged on Friday" [syn: hang]

  2. add as if on a string; "string these ideas together"; "string up these songs and you'll have a musical" [syn: string]