From Longman Dictionary of Contemporary Englishbesidesbe‧sides /bɪˈsaɪdz/ ●●○ adverb, preposition informal1AND/ALSO spoken used when adding another reasonI need the money. And besides, when I agree to do something, I do it.RegisterIn written English, people do not usually use besides as a sentence adverb. They start a sentence with the more formal moreover instead:Moreover, smoking is linked with heart disease and strokes.2in addition to someone or something else that you are mentioningThe area has stunning scenery, beautiful beaches, and much more besides.People choose jobs for other reasons besides money.Besides myself, the only English people there were Keith and Doreen.besides doing somethingBesides being heartbroken, she felt foolish.
Examples from the Corpus
besides• Besides going to aerobics twice a week, she rideshorses on Saturdays.• Sonya says she couldn't get here through all the snow. Besides, her car's broken down.• I wanted to help her out. Besides, I needed the money.• I don't mindpicking up your things from the store. Besides, the walk will do me good.