be ‧ sides /bɪˈsaɪdz/ BrE AmE adverb , preposition informal
1 . spoken used when adding another reason:
I need the money. And besides, when I agree to do something, I do it.
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In written English, people do not usually use besides as a sentence adverb. They start a sentence with the more formal moreover instead:
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Moreover, smoking is linked with heart disease and strokes.
2 . in addition to someone or something else that you are mentioning:
The 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 something
Besides being heartbroken, she felt foolish.