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Jyutping sei2 caang3
Pinyin sǐ chēng

Definitions (粵典–words.hk)
  1. 動詞
    衰​咗​之​後​唔​肯認​,​頑固​噉​堅持​自己​嗰​套
    to stubbornly refuse to admit failure or error; to insist with undue firmness that something is true when it is obviously not
    • 明明係你偷,你仲死撐話自己冇偷嘢!
      明明系你偷,你仲死撑话自己冇偷嘢!
      ming4 ming4 hai6 nei5 tau1, nei5 zung6 sei2 caang3 waa6 zi6 gei2 mou5 tau1 je5!
      You obviously stole it, but you still insist that you didn't do it!
  2. 動詞
    明明​好​辛苦​、​就​嚟​頂​唔​順​,​但​係​都​夾硬​捱​落​去​,​唔​肯​休息
    to withstand great pain and refuse to rest; to force oneself to endure
    • 你咁痛仲死撐,返屋企休息啦!
      你咁痛仲死撑,返屋企休息啦!
      nei5 gam3 tung3 zung6 sei2 caang3, faan1 uk1 kei2 jau1 sik1 laa1!
      You're in so much pain, and you're still forcing yourself to do it. Go home and take a rest!

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Jyutping sei2 caang1
Pinyin sǐ chēng

Definitions (CC-CANTO)
  1. persist on one's action even knowing it's wrong (spoken)
Definitions (Wiktionary)
  1. verb, colloquial
    to refuse to admit fault or error; to insist on standing for something that is obviously wrong
  2. verb, colloquial
    to force oneself to endure pain, hardship, etc.
Definitions (Kaifangcidian)
  1. 硬撐 – 硬撑
  2. 嘴硬
  3. 死頂著 – 死顶着
  4. 拼命撐著 – 拼命撑着
Examples (粵典–words.hk)
  1. Cantonese
    明明系你偷,你仲死撑话自己冇偷嘢!
    明明係你偷,你仲死撐話自己冇偷嘢!
    ming4 ming4 hai6 nei5 tau1, nei5 zung6 sei2 caang3 waa6 zi6 gei2 mou5 tau1 je5!
    • You obviously stole it, but you still insist that you didn't do it!
  2. Cantonese
    你咁痛仲死撑,返屋企休息啦!
    你咁痛仲死撐,返屋企休息啦!
    nei5 gam3 tung3 zung6 sei2 caang3, faan1 uk1 kei2 jau1 sik1 laa1!
    • You're in so much pain, and you're still forcing yourself to do it. Go home and take a rest!