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Jyutping dat6 dat6
Pinyin tū tū

Definitions (CC-CEDICT)
  1. convex on both sides (of lens)
  2. biconvex
Examples (粵典–words.hk)
  1. Cantonese
    佢阿妈比佢激到眼凸凸。
    佢阿媽比佢激到眼凸凸。
    keoi5 aa3 maa1 bei2 keoi5 gik1 dou3 ngaan5 dat6 dat6.
    • His mom was so mad at him that her eyes were coming out of their sockets.
Examples (Wiktionary)
  1. Cantonese
    听人讲手指甲凹凹凸凸系表示健康有问题。
    听人讲手指甲凹凹凸凸系表示健康有问题。
    teng1 jan4 gong2 sau2 zi2 gaap3 nap1 nap1 dat6 dat6 hai6 biu2 si6 gin6 hong1 jau5 man6 tai4.
    • I hear that uneven fingernails indicate there are some health issues.