Question

Which literary device is this?
"When I am gone, he can put some dust on his shoes as he has always wanted."

~Thanks
(I'm debating between idiom and allusion)

Answer 1

the answer to this is allusion

Answer 2

idiom is when you say something sarcastically like "break a leg!" or something like that! allusion is when you say something related to a political thing about humans, animals, objects, etc. so the answer to that will be allusion