旁门左道

dissenting religious sect (idiom); heretical school of opinion / dissident group

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)

road / path / CL:條|条[tiao2],股[gu3] / principle / truth / morality / reason / skill / method / Dao (of Daoism) / to say / to speak / to talk / classifier for long thin things (rivers, cracks etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process / (old) circuit (administrative division)

left / the Left (politics) / east / unorthodox / queer / wrong / differing / opposite / variant of 佐[zuo3]

one side / other / different / lateral component of a Chinese character (such as 刂[dao1], 亻[ren2] etc)

side door