There are two ways to say "Sorry" in Cantonese, at least:
1. deoi3 m4 zyu6
对唔住 = Sorry (deoi3 = face, m4 = not, zyu6 = hold/up ... I cannot face you or hold my head up to you... because I feel sorry..)
2. We will talk about the 2nd way in our next post. (《== click here )