腦洞大開 nǎo dòng dà kāi

DEFINITIONS

  1. imaginative
  2. to have one's mind buzzing with ideas

CHARACTERS

腦 nǎo brain
洞 dòng
HSK 5
cave, grotto; ravine; hole
大 dà
HSK 1
big, great, vast, large, high
開 kāi open; initiate, begin, start