To speak or write aimlessly
drift, stray, diverge, meander, blather, talk nonsense, chatter, babble, digress, maunder, get off the point, get off the subject, go off on a tangent, go on and on, talk discursively, write without sequence of ideas, expatiate, protract, enlarge, descant, be diffuse, prose, dwell on, harp on, dilate, amplify, go astray, wander, gossip, drivel, rant and rave, talk at random, talk off the top of one's head, beat around the bush.