腦洞大開 Save Sign in to save words Simplified: 脑洞大开 nǎodòngdàkāi ㄋㄠˇ ㄉㄨㄥˋ ㄉㄚˋ ㄎㄞ imaginative to have one's mind buzzing with ideas Character by character 腦(nǎo)brain 洞(dòng)cave 大(dà)big 開(kāi)open A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0