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)
a fire in the city gates is also a calamity for the fish in the moat (idiom); the bystander will also suffer / fig. you can't escape responsibility for your actions / ask not for whom the bell tolls - it tolls for thee