Here are some ways to translate it into English, depending on the context:
* Repent: This is the most accurate translation in general.
* Regret: This is a good alternative if the context focuses on feelings of sadness or remorse.
* Be sorry: This is a more informal way of saying it.
* Feel remorse: This emphasizes the feeling of guilt and shame.
* Change one's ways: This emphasizes the act of changing one's behavior.
For example:
* Magsisisi ka sa ginawa mo. (You will repent for what you did.)
* Magsisisi ka sa hindi mo paggawa nito. (You will regret not doing this.)
The best translation will depend on the specific context of the sentence.