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Jyutping geoi1 gou1 bat1 haa6
Pinyin jū gāo bù xià

Definitions (CC-CEDICT)
  1. (of prices, rates etc) to remain high
Definitions (粵典–words.hk)
  1. 形容詞
    形容​數值​或​形勢​維​持​喺​高位​,​冇​下跌​跡象
    to remain at a high point, with no signs of decrease
    • 呢個明星拍咗套成名作之後,人氣一直居高不下。
      呢个明星拍咗套成名作之后,人气一直居高不下。
      lei1 go3 ming4 sing1 paak3 zo2 tou3 sing4 ming4 zok3 zi1 hau6, jan4 hei3 jat1 zik6 geoi1 gou1 bat1 haa6.
      The star has become wildly popular since their film became a hit; their popularity is still at the top.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to stay high (and not decrease); to remain high
Examples (粵典–words.hk)
  1. Cantonese
    《楚留香》当时播映,乃系风靡全台,家家足不出户,夜晚条街冇人,据闻收视居高不下,纪录至今未破。
    《楚留香》當時播映,乃係風靡全臺,家家足不出户,夜晚條街冇人,據聞收視居高不下,紀錄至今未破。
    • X
  2. Cantonese
    呢个明星拍咗套成名作之后,人气一直居高不下。
    呢個明星拍咗套成名作之後,人氣一直居高不下。
    lei1 go3 ming4 sing1 paak3 zo2 tou3 sing4 ming4 zok3 zi1 hau6, jan4 hei3 jat1 zik6 geoi1 gou1 bat1 haa6.
    • The star has become wildly popular since their film became a hit; their popularity is still at the top.