Diverge and Go off on tangent

Diverge verb - To change one's course or direction.

Go off on tangent and diverge are semantically related In some cases you can use "Go off on tangent" instead a verb "Diverge".

Diverge and go off on tangent are semantically related in digress topic. You can use "Diverge" instead a verb phrase "Go off on tangent", if it concerns topics such as deviate, endlessly, stray from normal path.