The word 'didn't' is a contraction of the words 'did not'. When using it in a sentence with the words 'mean to' you are informing someone that you did something you regret or are sorry for. This could have been a physical, mental or verbal action.
Learn English speaking much FASTER by downloading the TalkEnglish Offline Package and submerge yourself with over 8,000 audio files and over 800 pages of lessons! Then you can study without Internet connection and also listen to audio files using your MP3 player at any time. Go to the English Download page and download today!