The phrase "to free up" means to make something available or release something from a constraint, so that it can be used for another purpose. Full definition
This is useful for freeing up space in the status bar, especially if you use your phone as your main alarm clock. (android.gadgethacks.com)
Planning ahead and doing a few simple chores around the home this fall will not only allow for a stress - free winter but also free up more time to enjoy the holidays. (lifestorage.com)
If you can swing it, hiring other people — such as someone to cut your grass and clean your house — will also free up time for you to spend with your children. (policygenius.com)