Wiktionary
substitution of attorney
n. A document in which the party to a lawsuit states that his/her attorney of record is being substituted for by another attorney or by the party acting for himself/herself (in propria persona).
Wikipedia
Substitution of attorney
A substitution of attorney is a legal document that may be created during a lawsuit if a party wishes to replace its attorney with another one. Both attorneys must sign the document (which is otherwise void).
Category:Legal procedure