I'm sorry.

Meaning: This means to tell someone that you feel bad about something you have done or said. It's like saying, I made a mistake and I feel bad about it.

Choice of Words: Sorry is an adjective that expresses regret, remorse, or apology for something done or said. I'm is a contraction of "I am," indicating the speaker's ownership of the feeling. "I'm sorry" is a sincere expression of regret or apology, acknowledging wrongdoing or causing harm.