Question

One word for the wander from the topic of discussion

Answer 1

One word that means ‘to wander from the topic of discussion’ is ‘digress’.

Digress means ‘to start to talk about something that is not connected with the main point of what you are saying. For example, ‘The professor while explaining the laws of gravity, digress quite frequently from the main topic.’

There are other words such as ‘sidetrack’, divagate, etc. which also mean the same.