屋上架屋 Origin — Chinese Character Wiki

wūshàngjiàwū

unnecessary repetition

屋 wū noun

house

(bound form) house; building
上 shang locative

on

(suffix) on; in; at; on the surface of; used after a noun to indicate a location, scope, or aspect
架 jià verb

to support

To put up or erect; to support or prop up something from underneath; to place an object on top of another.
屋 wū noun

house

(bound form) house; building