中流砥柱 zhōng liú dǐ zhù

DEFINITIONS

  1. mainstay
  2. cornerstone
  3. tower of strength

CHARACTERS

中 zhōng
HSK 1
central; center, middle; in the midst of; hit (target); attain
流 liú
HSK 4
flow, circulate, drift; class
砥 dǐ a whetstone; to polish
柱 zhù
HSK 6
pillar, post; support; lean on