ἀποτελῶ [1 verse](verb 1st sg pres ind act) "I do" is epiteleo (apoteleo) which means to "bring to an end," "complete," "produce," "accomplish," "perform," "render," "fill up," and "satiate." -- The Greek verb translated as  "I do" is used by Jesus only here. It isn't the normal "do," but it means "bring to an end," "complete," "produce," "accomplish," "perform," "render," "fill up," and "satiate."