(historical) To cut the two halves of a document in duplicate, using a jagged or wavy line so that each party could demonstrate that their copy was part of the original whole.
(intransitive, reflexive, obsolete) To enter into a binding agreement by means of such documents; to formally commit (to doing something); to contract.
(typography) To begin (a line or lines) at a greater or lesser distance from the margin. See indentation, and indention. Normal indent pushes in a line or paragraph. "hanging indent" pulls the line out into the margin.