fixie
n.— «The “fixie” (n): A fixed-gear, single-speed bike without a freewheel, used for racing at bike tracks known as velodromes.» —“Fixed-sated: Coasting is for poseurs. Fixed-gear bikes are about the pedaling” by Florangela Davila Seattle Times (Wash.) Mar. 30, 2006. (source: Double-Tongued Dictionary)
Further reading
Susan from Seattle, Washington, has observed her toddler granddaughter starting to exclaim Uh-oh! when something goes amiss. Is that something she picked up from adults, or do adults pick it up from children? By 18 months, children have already...