扼守 [－－]

Jyutping ak1 sau2
Pinyin è shǒu

Definitions (粵典–words.hk)
  1. 動詞
    利用​險要​地形​堅守​防御
    To defend a place using the contours of the land
    • 個將軍利用四川嘅地形，以一千人守住敵人一萬人嘅入侵。
      个将军利用四川嘅地形，以一千人守住敌人一万人嘅入侵。
      go3 zoeng1 gwan1 lei6 jung6 sei3 cyun1 ge3 dei6 jing4, ji5 jat1 cin1 jan4 sau2 zyu6 dik6 jan4 jat1 maan6 jan4 ge3 jap6 cam1.
      The general defended Sichuan using the peculiar landscape with one thousand troops against an invasion of ten thousand.

扼守 [－－]

Jyutping aak1 sau2
Pinyin è shǒu

Definitions (CC-CEDICT)
  1. to hold a pass
  2. to guard (a strategic location)
Definitions (粵典–words.hk)
  1. 動詞
    利用​險要​地形​堅守​防御
    To defend a place using the contours of the land
    • 個將軍利用四川嘅地形，以一千人守住敵人一萬人嘅入侵。
      个将军利用四川嘅地形，以一千人守住敌人一万人嘅入侵。
      go3 zoeng1 gwan1 lei6 jung6 sei3 cyun1 ge3 dei6 jing4, ji5 jat1 cin1 jan4 sau2 zyu6 dik6 jan4 jat1 maan6 jan4 ge3 jap6 cam1.
      The general defended Sichuan using the peculiar landscape with one thousand troops against an invasion of ten thousand.
Definitions (Wiktionary)
  1. verb
    to guard (a strategic location); to hold (a pass)
    (syn.) 把守, 守把