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Jyutping si1 mou2
Pinyin sī mào

Definitions (Kaifangcidian)
  1. 螺母
  2. 螺帽
  3. 螺絲母 – 螺丝母

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Jyutping si1 mou6
Pinyin sī mào

Definitions (Wiktionary)
  1. noun, Cantonese
    screw nut
    (syn.) 螺絲帽兒, 螺帽, 螺絲帽, 螺母兒, 螺絲母子, 螺絲母兒, 絲帽, 螺絲母, 螺絲帽子, 螺母, 螺絲, 螺帽兒
Examples (粵典–words.hk)
  1. Cantonese
    螺丝帽
    螺絲帽
    lo4 si1 mou2
    • nut (as a fastening hardware)
  2. Cantonese
    我哋要扭实粒螺丝帽先得。
    我哋要扭實粒螺絲帽先得。
    ngo5 dei6 jiu3 nau2 sat6 nap1 lo4 si1 mou2 sin1 dak1.
    • We can't do without fastening up the nut.