talk off top of head

babble digress meander wander

amplify blather chatter depart descant divagate diverge drift drivel enlarge expatiate gossip maunder prose protract stray

be diffuse beat around bush dwell on excurse get off the subject go astray go off on tangent go on and on harp on lose the thread rant and rave rattle on talk nonsense talk randomly

go direct stay

abridge compress condense curtail decrease lessen reduce shorten

be direct