one-horse

adjective

1. using or having only a single horse: a one-horse carriage.
2. small and unimportant; limited: a one-horse town.

adjective

1. drawn by or using one horse
2. (prenominal) informal small or obscurea one-horse town

adj.“small-scale, petty” 1853, American English, colloquial, in reference to towns so small they only had one horse.