estabeleceis
Estabeleceis is a Portuguese verb, specifically the second-person plural of the present indicative or imperative mood of the verb "estabelecer." The verb "estabelecer" itself translates to "to establish," "to set up," "to found," "to institute," or "to decree." Therefore, "estabeleceis" conveys the action of establishing, setting up, or decreeing as performed by "you all" (plural "you").
In the present indicative, "estabeleceis" would be used in a sentence like "Vós estabeleceis as regras" (You