In domain name systems, a lame delegation, also known as a lame response, is a type of error that results when a name server is designated as the authoritative server for a domain name for which it does not have authoritative data.
American Registry for Internet Numbers (ARIN) has a Draft Policies and Proposals concerning lame delegations - Policy 2002-1: Lame Delegations in IN-ADDR.ARPA . See https://www.arin.net/policy/proposals/2002_1.html
References
Lame delegation Wikipedia(Text) CC BY-SA