For all practical purposes, time isn't fast or slow. It marches into the future at a stately 60 seconds per minute. Fast and slow refer to speed.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
AnonymousCan't too fast be used for clocks too ,as in The clock is 15 minnues too fast ?No - at least not in my variety of BrE.