開門

to open a door (lit. and fig.) / to open for business

to open / to start / to turn on / to boil / to write out (a prescription, check, invoice etc) / to operate (a vehicle) / carat (gold) / abbr. for Kelvin, 開爾文|开尔文[Kai1 er3 wen2] / abbr. for 開本|开本[kai1 ben3], book format

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)

lit. to open the door and see the mountain; fig. to get right to the point (idiom)

a good beginning

firecrackers set off at the stroke of midnight on New Year's Day (a Chinese tradition)

half-open door / fig. prostitute

erhua variant of 半開門|半开门[ban4 kai1 men2]

leaving the door open invites the thief (idiom); to invite disaster by giving evildoers a free hand