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Jyutping ji5 sak1
Pinyin ěr sai

Definitions (Wiktionary)
  1. noun, dialectal
    earwax
    (syn.) 耳朵屙, 耳川屎, 耳仔屎, 耳纏, 耳碎子, 膜, 耳馬, 新人惡, 耳心, 耳碎, 耳朵惡, 耳空屎, 耳次, 耳朵屎, 耳殘, 耳㞎㞎, 耳髓, 耵聹, 耳塞, 耳柴, 耳蛹兒, 耳垢, 耳朵涴, 耳朵污, 耳屎, 耳塞子

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Jyutping ji5 sak1
Pinyin ěr sāi

Definitions (CC-CEDICT)
  1. earplug
  2. earphone
Definitions (粵典–words.hk)
  1. 名詞
    塞​喺​耳​嘅​嘢​,​用​嚟​隔聲​或​隔水​(​量​詞​:​個​/​對​)
    earplug
    • 我游水要戴耳塞。
      我游水要戴耳塞。
      ngo5 jau4 seoi2 jiu3 daai3 ji5 sak1.
      I wear earplugs while swimming.
  2. 名詞
    耳筒​;​耳機
    earphone
Definitions (Wiktionary)
  1. noun
    earphone; earpiece
  2. noun
    earplug
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我不得不戴耳塞来阻隔旁边建筑工地的所有噪音。
    我不得不戴耳塞來阻隔旁邊建築工地的所有噪音。
    wǒ bù dé bù dài ěr sāi lái zǔ gé páng biān jiàn zhù gōng dì de suǒ yǒu zào yīn 。
    • I have to wear earplugs to drown out all the noise from the construction site next door.
  2. Mandarin
    我塞了耳塞。
    我塞了耳塞。
    wǒ sāi le ěr sāi 。
    • I put in earplugs.
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    佢用耳塞听紧电台。
    佢用耳塞聽緊電台。
    keoi5 jung6 ji5 sak1 ting1 gan2 din6 toi4 。
    • He was listening to the radio with his earphone.
Examples (粵典–words.hk)
  1. Cantonese
    我游水要戴耳塞。
    我游水要戴耳塞。
    ngo5 jau4 seoi2 jiu3 daai3 ji5 sak1.
    • I wear earplugs while swimming.
  2. Cantonese
    用风炮掘路咁鬼嘈,啲修路工人连耳塞都唔带个嘅?
    用風炮掘路咁鬼嘈,啲修路工人連耳塞都唔帶個嘅?
    jung6 fung1 paau3 gwat6 lou6 gam3 gwai2 cou4, di1 sau1 lou6 gung1 jan4 lin4 ji5 sak1 dou1 m4 daai3 go3 ge2?
    • It is so freaking loud using a jackhammer to dig the road, why those workers don't wear any ear protection?