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Etymology data from Wiktionary via Wiktextract (CC BY-SA 4.0). Chinese character data from the 說文解字, the Taiwan MOE 國語辭典簡編本 (CC BY-ND 3.0 TW) and HSK/TOCFL lists.

Explanations are written by a local model (gemma4) and only published after a verification pass against the cited sources. How it works.

Chinese

天下第一

/tʰi̯ɛn⁵⁵ ɕi̯ä⁵¹⁻⁵³ ti⁵¹⁻⁵³ i⁵⁵⁻⁵¹/
number one in the world; peerless; unequaled
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    The phrase describes being the singular, peerless entity existing beneath the vastness of the heavens.
    The phrase describes being the singular, peerless entity existing beneath the vastness of the heavens.

    Origin

    The phrase is composed of the characters 天 (sky; heavens; heavenly; celestial), 下 (lower part of; under; beneath), 第 (sequence; number), and 一 (one).

    Within these characters, 天 is formed with the semantic component 大 (of great size; big; large; huge) and the phonetic component 丁 (the fourth of the ten heavenly stems). The character 第 uses the semantic component 竹 (bamboo) and the phonetic component 弟 (younger brother).

    Confidence: high · written by gemma4:26b, checked statement-by-statement against the sources below.

    這個詞組由四個漢字組成。其中「天」字包含表示意義的成分「大」，意指巨大；同時也包含表示聲音的成分「丁」。「下」字表示下方、底下或在……之下。「第」字包含表示意義的成分「竹」，並以「弟」作為表示聲音的成分。「一」則代表數字一。

    從字形結構來看，「天下第一」結合了「天」（天空、天上的）、「下」（下方、之下）、「第」（序列、次序）與「一」（一）這四個部分，用以表達在天下之中排名第一的含義。

    Confidence: high · written by gemma4:26b, checked statement-by-statement against the sources below.

    Lineage

    • characterChinese天 “sky; heavens; heavenly; celestial”
      • meaningChinese大 “of great size; big; large; huge”
      • soundChinese丁 “the fourth of the ten heavenly stems”
    • characterChinese下 “lower part of; under; beneath”
    • characterChinese第 “sequence; number”
      • meaningChinese竹 “bamboo (Classifier: 枝; 棵 m; 根 m; 轆／辘 c)”
      • soundChinese弟 “younger brother”
    • characterChinese一 “one”
    Wiktionary etymology text

    No etymology text yet. The graph shows what is known from the sources.

    Meanings

    phrase
    1. number one in the world; peerless; unequaled

    Sources

    • etymagent (local gemma4:26b) — Generated
    • Written form — n/a
    • Wiktionary (via Wiktextract / kaikki.org) — CC BY-SA 4.0