servire

exert oneself by doing mental or physical work for a purpose or out of necessity

perform a job or duty on a rotating basis

perform duties attached to a particular office or place or function

be a delegate or spokesperson for; represent somebody's interest or be a proxy or substitute for, as of politicians and office holders representing their constituents, or of a tenant representing other tenants in a housing dispute

give help or assistance; be of service

give what is desired or needed, especially support, food or sustenance

give what is desired or needed, especially support, food or sustenance

perform as expected when applied

serve as a prelude or opening to

function as or act like

have the quality of being; (copula, used with an adjective or a predicate noun)