Being too onerous

Usage examples of overtaxing.

I have not been collecting and hoarding a fortune by overtaxing the peasants of Corwell!

I applied myself to the work and found it not overtaxing, but the pleasures of sitting on a damp rock watching sheep all day soon palled, and I began to yearn for other ways to occupy myself.

You have a strong constitution but also you don't know when you are in danger of overtaxing yourself.

Lupin is hardly overtaxing you — I would expect first years to be able to deal with Red Caps and Grindylows.