What is Beside ?
Beside is (prep) 1. at the side of someone or something Come and sit down beside me. The office is just beside the railway station. it’s beside the point it’s got nothing to do with the main subject Whether or not the coat matches your hat is beside the point it’s simply too big for you. 2. to be beside yourself with to be in a very agitated or excited state because of something The parents were beside them selves with worry when their daughter did not come home from school. She was beside herself with grief.
source: Easier English, Student Dictionary Upper Intermediate Level