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Jyutping siu2 saam1
Pinyin xiǎo sān

Definitions (CC-CEDICT)
  1. mistress
  2. the other woman (coll.)
  3. grade 3 in elementary school
Definitions (粵典–words.hk)
  1. 名詞
    小學​三年​級​嘅​簡​稱
    short form of the 3rd year of primary school, like calling P.3 in English; literally : little 3
    • 我個女今年讀小三。
      我个女今年读小三。
      ngo5 go3 neoi2 gam1 nin2 duk6 siu2 saam1.
      My daughter is in P.3 this year.
  2. 名詞
    第三者​、​外遇​、​狐狸精​,​小​三​喺​中​國​大​陸​比​較​常用
    mistress, a woman having a sexual relationship with a married man; this term is more commonly used in Mainland China
    • 我老公出面有小三。
      我老公出面有小三。
      ngo5 lou5 gung1 ceot1 min6 jau5 siu2 saam1
      My husband has a mistress outside.
Definitions (Wiktionary)
  1. noun
    primary three; third year in primary school
  2. noun, colloquial, neologism
    other woman; someone romantically involved with a person already in a committed relationship; mistress
    (syn.) 第三者
    • 小三勸退師
      小三劝退师
      xiǎo sān quàn tuì shī
      one who helps a woman dispel her husband's mistress; mistress dissuader
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我比你小三岁。
    我比你小三歲。
    wǒ bǐ nǐ xiǎo sān suì 。
    • I'm three years younger than you.
    • I'm three years younger than you are.
  2. Mandarin
    他比我小三岁。
    他比我小三歲。
    tā bǐ wǒ xiǎo sān suì 。
    • He is younger than me by three years.
  3. Mandarin
    汤姆比玛丽小三岁。
    湯姆比瑪麗小三歲。
    tāng mǔ bǐ mǎ lì xiǎo sān suì 。
    • Tom is three years younger than Mary.
    • Tom is three years younger than Mary is.
Examples (粵典–words.hk)
  1. Cantonese
    我个女今年读小三。
    我個女今年讀小三。
    ngo5 go3 neoi2 gam1 nin2 duk6 siu2 saam1.
    • My daughter is in P.3 this year.
  2. Cantonese
    我老公出面有小三。
    我老公出面有小三。
    ngo5 lou5 gung1 ceot1 min6 jau5 siu2 saam1
    • My husband has a mistress outside.
Examples (Wiktionary)
  1. Mandarin
    我妹妹比我小三岁。
    我妹妹比我小三歲。
    wǒ mèi mèi bǐ wǒ xiǎo sān suì .
    • My sister is 3 years younger than me.
  2. Mandarin
    小三劝退师
    小三勸退師
    xiǎo sān quàn tuì shī
    • one who helps a woman dispel her husband's mistress; mistress dissuader
  3. Mandarin
    小三上位
    小三上位
    xiǎo sān shàng wèi
    • the mistress displaces the wife
  4. Mandarin
    旗津到温州这样的地点根本没有在小三通里面如果他们私自小三通的话是违法的
    旗津到温州這樣的地點根本沒有在小三通裏面如果他們私自小三通的話是違法的
    qí jīn dào wēn zhōu zhè yàng de dì diǎn gēn běn méi yǒu zài xiǎo sān tōng lǐ miàn rú guǒ tā men sī zì xiǎo sān tōng de huà shì wéi fǎ de
    • The Cijin to Wenzhou route is absolutely not within the scope of the three mini links. If they establish a route under the three mini links without explicit approval, that is illegal.