居高不下

jūgāobùxià
(of prices, rates etc) to remain high

CEDICT

to stay high (and not decrease); to remain high

Wiktionary

处于高位而不下滑。如：「由于颱风来袭，蔬果价格一直居高不下。」「这位民意代表勤跑基层，积极服务民众，所以民调满意度一直居高不下。」

重編國語辭典

Entry Composition

1 居 jū
  1. to reside
  2. to be (in a certain position)
  3. to store up
  4. to be at a standstill
  5. residence
  6. house
  7. restaurant
  8. classifier for bedrooms
2 高 gāo
  1. high
  2. tall
  3. above average
  4. loud
  5. your (honorific)
3 不下 bùxià to be not less than (a certain quantity, amount etc)