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Jyutping dong1 si6 si4
Pinyin dāng shì shí

Definitions (Wiktionary)
  1. adj, Min-Nan
    timely
    (syn.) 照时, 赴时, 适时, 適時, 及时, 按時, 照时阵, 按时, 準時, 准时, 照時陣, 照時, 赴時, 及時