Expunge vs Set_aside - What's the difference?

Expunge is a related term of set_aside.

is that expunge is to erase or strike out while set_aside is (idiomatic) to separate and reserve something for a specific purpose.

(expung)

To erase or strike out.

To eliminate completely; annihilate.

* expunction

(idiomatic) To separate and reserve something for a specific purpose.

Plan to set aside three or four hours to see the museum.

(idiomatic) To leave out of account; to omit or neglect.

* Tillotson

Setting aside all other considerations, I will endeavour to know the truth, and yield to that.

(idiomatic) To disagree with something and reject or overturn it.

(idiomatic) To declare something invalid or null and void.

* raise, beg (as in beg the question) (of a question)