What does 'shunt' mean in the context of amplifiers?
In the case of amplifiers with feedback, 'shunt' can mean to connect the input of the feedback network (e.g., a voltage divider) in parallel to the amp output... or the output of the feedback network to the amp input. I hope you know what 'in parallel' means?

If the input impedance of the feedback network is high enough, it will not 'shunt' (divert current from) the amp output. That is why, I prefer to name this connection 'parallel'.