one-horse town
A small and unimportant place, as in Ours was just a one-horse town until the nuclear plant was built. This expression, first recorded in 1857, presumably alluded to a town so small that a single horse would suffice for its transportation needs.
Words nearby one-horse town
one-down,
one-eighty,
one-eyed,
one-handed,
one-horse,
one-horse town,
one-legged,
one-liner,
one-lung,
one-lunger,
one-man