in the middle
prep. phr..prep. phr.. In the center of a space, or between two points, people, or things.
prep. phr.. An adverbial phrase indicating a central position, either spatially between two or more entities or within a single entity.
The bed goes in the middle.
I don't want an aisle seat or a window seat; I'd prefer to sit in the middle.
The proposed legislation was neither radically progressive nor deeply conservative, falling somewhere in the middle of the established political consensus.
This phrase can stand alone to answer 'where?', often at the end of a clause.
Contrast with 'in the middle of something', where the object is specified; 'in the middle' functions as a complete adverbial of place on its own.
The ball is on middle.The ball is in the middle.The correct preposition is 'in', not 'on', to describe a central position within an area.