洞 dòng, cave/hole/zero (unambiguous spoken form when spelling out numbers)/CL:個|个[gè] 洞穴 dòngxué, cave/cavern 漏洞 lòudòng, leak/hole/gap/loophole 黑洞 hēidòng, (astronomy) black hole 山洞 shāndòng, cavern/cave 空洞 kōngdòng, cavity/empty/vacuous 洞察力 dòngchálì, insight 防空洞 fángkōngdòng, air-raid shelter 洞口 Dòngkǒu/dòngkǒu, Dongkou county in Shaoyang 邵陽|邵阳[Shào yáng], Hunan, cave mouth/tunnel entrance 洞悉 dòngxī, to clearly understand 洞察 dòngchá, to see clearly 地洞 dìdòng, tunnel/cave/burrow/dugout 漏洞百出 lòudòngbǎichū, lit. one hundred loopholes (idiom); full of mistakes (of speech or article) 无底洞 wúdǐdòng, [無底洞], bottomless pit 引蛇出洞 yǐnshéchūdòng, lit. to pull a snake from its hole/to expose a malefactor (idiom) 洞窟 dòngkū, a cave 坑洞 kēngdòng, hole/pit/pothole 洞开 dòngkāi, [洞開], to be wide open 洞房花烛 dòngfánghuāzhú, [洞房花燭], bridal room and ornamented candles/wedding festivities (idiom) 洞房 dòngfáng, secret inner room/bridal room 风洞 fēngdòng, [風洞], wind tunnel 空洞无物 kōngdòngwúwù, [空洞無物], empty cave, nothing there (idiom); devoid of substance/nothing new to show 黑洞洞 hēidòngdòng, pitch-dark 门洞 méndòng, [門洞], passageway/archway 冰洞 bīngdòng, hole in ice/crevasse 隧洞 suìdòng, tunnel 窑洞 yáodòng, [窯洞], yaodong (a kind of cave dwelling in the Loess Plateau in northwest China)/CL:孔[k... 别有洞天 biéyǒudòngtiān, [別有洞天], place of charm and beauty/scenery of exceptional charm/completely different worl... 溶洞 róngdòng, karst cave 一击入洞 yījīrùdòng, [一擊入洞], hole in one (golf) 一杆进洞 yīgānjìndòng, [一桿進洞], (golf) hole in one 人字洞 Rénzìdòng, Renzidong palaeolithic archaeological site at Fanchang 繁昌[Fán chāng], Anhui 克孜尔千佛洞 Kèzīěrqiānfódòng, [克孜爾千佛洞], Kezil thousand-Buddha grotto in Baicheng 拜城, Aksu 阿克蘇地區|阿克苏地区, Xinjiang 凹洞 āodòng, cavity/pit 函洞 hándòng, variant of 涵洞[hán dòng] 千佛洞 qiānFódòng, Buddhist grottos 吕洞宾 LǚDòngbīn, [呂洞賓], Lü Dongbin (796-), Tang Dynasty scholar, one of the Eight Immortals 八仙[Bā xiān] 大地洞 dàdìdòng, cavern 大浦洞 Dàpǔdòng, Taepodong, North Korean rocket series 小岩洞 xiǎoyándòng, grotto 小洞不堵沉大船 xiǎodòngbùdǔchéndàchuán, A small hole not plugged will sink a great ship. 小洞不堵，大洞受苦 xiǎodòngbùdǔ,dàdòngshòukǔ, A small hole not plugged will make you suffer a big hole (idiom); A stitch in ti... 小洞不堵，大洞吃苦 xiǎodòngbùdǔ,dàdòngchīkǔ, a small hole not plugged will give you grief when it gets bigger (idiom)/a stitc... 小洞不堵，大洞难补 xiǎodòngbùdǔ,dàdòngnánbǔ, [小洞不堵，大洞難補], If you don't plug the small hole, the big hole will be hard to repair (idiom); A... 小洞不补大洞吃苦 xiǎodòngbùbǔdàdòngchīkǔ, [小洞不補大洞吃苦], A small hole not plugged will make you suffer a big hole (idiom); a stitch in ti... 库木吐拉千佛洞 Kùmùtǔlāqiānfódòng, [庫木吐拉千佛洞], Kumutula thousand-Buddha grotto in Kuqa, Xinjiang 开脑洞 kāinǎodòng, [開腦洞], to blow people's minds with highly imaginative, bizarre ideas 张之洞 ZhāngZhīdòng, [張之洞], Zhang Zhidong (1837-1909), prominent politician in late Qing 打洞 dǎdòng, to punch a hole/to drill a hole/to dig a hole/to burrow 挖洞 wādòng, to dig a hole 柏克里克千佛洞 Bókèlǐkèqiānfódòng, Paziklike thousand-Buddha grotto in the Turpan basin, Xinjiang 水帘洞 shuǐliándòng, [水簾洞], cave with a waterfall at its mouth 洞口县 Dòngkǒuxiàn, [洞口縣], Dongkou county in Shaoyang 邵陽|邵阳[Shào yáng], Hunan 洞天 dòngtiān, paradise/heavenly or beautiful place/fairyland 洞头 Dòngtóu, [洞頭], Dontou county in Wenzhou 溫州|温州[Wēn zhōu], Zhejiang 洞头县 Dòngtóuxiàn, [洞頭縣], Dontou county in Wenzhou 溫州|温州[Wēn zhōu], Zhejiang 洞子 dòngzi, cave/pit/(coll.) greenhouse 洞孔 dòngkǒng, hole 洞察一切 dòngcháyīqiè, to see everything clearly 洞府 dòngfǔ, cave dwelling/legendary abode of immortals 洞庭湖 DòngtíngHú, Dongting Lake in northeast Hunan province 洞房花烛夜 dòngfánghuāzhúyè, [洞房花燭夜], wedding night 洞泄 dòngxiè, lienteric diarrhea (TCM) 洞洞鞋 dòngdòngxié, Crocs shoes (or any similar shoe) 洞穿 dòngchuān, to penetrate/to pierce/to see clearly/to have an insight into 洞若观火 dòngruòguānhuǒ, [洞若觀火], clear as a flame (idiom); to see things absolutely clearly 洞螈 dòngyuán, olm (Proteus anguinus) 洞见 dòngjiàn, [洞見], insight/to see clearly 洞鉴 dòngjiàn, [洞鑒], to examine deeply/to inspect closely 洪洞 Hóngtóng, Hongtong county in Linfen 臨汾|临汾[Lín fén], Shanxi 洪洞县 Hóngtóngxiàn, [洪洞縣], Hongtong county in Linfen 臨汾|临汾[Lín fén], Shanxi 涵洞 hándòng, culvert 电洞 diàndòng, [電洞], electron hole (physics) 白洞 báidòng, white hole (cosmology) 石洞 shídòng, cave/cavern 破洞 pòdòng, a hole 空空洞洞 kōngkōngdòngdòng, empty/hollow/lacking in substance 穿洞 chuāndòng, pierce 老鼠洞 lǎoshǔdòng, mouse hole 耳洞 ěrdòng, pierced ear 脑洞大开 nǎodòngdàkāi, [腦洞大開], imaginative/to have one's mind buzzing with ideas 芦洞 Lúdòng, [蘆洞], Rodong or Nodong, series of North Korean medium-range missiles 藏经洞 zàngjīngdòng, [藏經洞], cave holding scripture depository, part of Mogao cave complex 莫高窟, Dunhuang 敦煌 虫洞 chóngdòng, [蟲洞], worm-hole (in cosmology and science fiction) 钥匙洞孔 yàoshidòngkǒng, [鑰匙洞孔], keyhole 钻洞 zuāndòng, [鑽洞], to bore/to burrow/to crawl through a tunnel 闹洞房 nàodòngfáng, [鬧洞房], disturbing the privacy of bridal room (Chinese custom where guests banter with a... 零日漏洞 língrìlòudòng, zero-day vulnerability (computing) 龋洞 qǔdòng, [齲洞], hole due to dental caries 龙洞 lóngdòng, [龍洞], cave/natural cavern (in limestone)