敲门砖

lit. a brick as a door knocker (idiom); fig. a temporary expedient / to use sb as a stepping stone to fortune

to hit / to strike / to tap / to rap / to knock / to rip sb off / to overcharge

to knock on a door

gate / door / CL:扇[shan4] / gateway / doorway / CL:個|个[ge4] / opening / valve / switch / way to do something / knack / family / house / (religious) sect / school (of thought) / class / category / phylum or division (taxonomy) / classifier for large guns / classifier for lessons, subjects, branches of technology / (suffix) -gate (i.e. scandal; derived from Watergate)

variant of 甎|砖[zhuan1]

variant of 磚|砖[zhuan1]

brick / CL:塊|块[kuai4]