transitive verb.
To punish (a person) without legal process or authority, especially by hanging, for a perceived offense or as an act of bigotry.
The Century Dictionary and Cyclopedia
To punish by lynch-law; punish summarily, for a crime or public offense of any kind, without authority of law; specifically, to punish with death in this manner. See lynch-law.
noun.
See linch.
the GNU version of the Collaborative International Dictionary of English
transitive verb.
To inflict punishment upon, especially death, without the forms of law, as when a mob captures and hangs a suspected person. See lynch law.