The phrase "put back" means to return something to its original position or place. There are many synonyms for this phrase that can be used interchangeably. These include words like replace, reposition, restock, reinstate, restore, reinsert, re-put, and reinstall. These words can be used when talking about putting books back on a shelf, returning a piece of equipment to its place, restocking shelves, reinstating a policy or rule, restoring an old building, reinserting a disc into a computer drive, or simply putting things back where they belong. Using alternate words helps to add variety to your writing and communicate ideas more effectively.