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Jyutping jat1 baan2 saam1 ngaan5
Pinyin yī bǎn sān yǎn

Definitions (CC-CEDICT)
  1. lit. one strong beat and three weak beats in a measure of music (four beats in the bar) (idiom); fig. scrupulous attention to detail
Definitions (Wiktionary)
  1. phrase, idiomatic
    Synonym of 一板一眼 (yībǎnyīyǎn, “scrupulous and methodical”).
    (syn.) 一板一眼
Examples (Wiktionary)
  1. Mandarin
    一板三眼
    一板三眼
    yī bǎn sān yǎn
    • one strong beat and three weak beats in the four-beat rhythm