What it means
It means to cover the full range of something, from one end to the other. You use it when opinions, moods, styles, or experiences go all over the shop instead of sitting in one neat lane. It sounds a bit polished, but loads of people still chuck it into everyday chat when they want to say it was the whole spread.
Usage examples
"That festival ran the gamut: banging first act, dodgy sound, a proper belter headliner, then security kicking everyone out while we queued for chips."
"Her new album runs the gamut from soft ballads to full-on rock."
"The reviews ran the gamut, from glowing praise to total takedowns."
"Mate, that group chat ran the gamut in ten minutes: holiday pics, breakup drama, a meme dump, then someone's nan asking for the Wi-Fi password."
"The comments on his new haircut ran the gamut from clean look, bro to you've butchered it, mate."
Where it comes from
It comes from medieval music. Gamut grew out of gamma ut, the name for the lowest note in an old scale system. From there, gamut came to mean the full musical range, then widened into everyday English for the whole span of anything, not just notes.
