Divagate and Rattle on

Divagate verb - Lose clarity or turn aside especially from the main subject of attention or course of argument in writing, thinking, or speaking.

Rattle on and divagate are semantically related In some cases you can use "Rattle on" instead a verb "Divagate".

Rattle on verb - Talk incessantly and tiresomely.

Divagate and rattle on are semantically related in endlessly topic. Sometimes you can use "Divagate" instead a verb "Rattle on".