1. Beside means next to.   

Pattern: verb + beside + noun
Please come over here and sit beside me.

Verbs commonly used with this pattern:
be, kneel, lie (down), rest, sit (down), sleep, stand, walk, work   

2. Expressions                       

beside the point—irrelevant
He always wastes time at our meetings by talking about things that are beside the point.       

beside oneself—extremely agitated
My mother is beside herself because she doesn't know where my brother is

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