attorn(v = verb.cognition) - acknowledge a new land owner as one's landlord; "he was attorned by the tenants"
is one way to acknowledge, admit
Sample sentences:
Somebody ----s
1. To turn, or transfer homage and service, from one lord to another. This is the act of feudatories, vassals, or tenants, upon the alienation of the estate. Blackstone. [1913 Webster]
2. To agree to become tenant to one to whom reversion has been granted. [1913 Webster]