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The term “home-grown” suggests that something is not commercially produced or purchased from a store but instead is made at home or made in an improvised way.
Today you heard that siren battles are a competition to see who can play music the loudest on home-grown speaker systems.
In this case, “home-grown” means speaker systems that are made or assembled locally or at home, rather than being professionally manufactured or imported. These speaker systems are typically not mass-produced and are be DIY (do-it-yourself) projects or created by individuals for their personal use.