TO OFFEND - [verb] to hurt someone's feelings
Examples of use
He seemed very offended, because I forgot his birthday.
She'd been always offending him in front of other people and had never showed her love, so he finally broke up the relationship.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her