from διάκονος; to be an attendant, i.e. wait upon (menially or as a host, friend, or (figuratively) teacher); technically, to act as a Christian deacon:--(ad-)minister (unto), serve, use the office of a deacon.
probably strengthened from the base of ἵστημι; properly, to set fast ("stall"), i.e. (figuratively) to repress (reflexively, abstain from associating with):--avoid, withdraw self.