It's hard to say an unbeaten horse is tailing off, but her ratings have declined.
From the dailynews.com
Spottails in the shallow backwaters on lures cast to fish tailing as they feed.
From the charlotteobserver.com
Such hiring is expected to have peaked in May and then begin tailing off in June.
From the time.com
Small-business hiring is at a nine-month low, and retail sales are tailing off.
From the bostonherald.com
Discoveries have been tailing off for years and refining is one big bottleneck.
From the economist.com
Piles of mine tailing cones stand on the horizon like a low range of mountains.
From the latimes.com
At the time, authorities inside the helicopter were tailing a burglary suspect.
From the huffingtonpost.com
You will quickly find out that you're tailing someone, and someone is tailing you.
From the tennessean.com
The car jerks for a second, then speeds ahead with the pick-up closely tailing it.
From the time.com
More examples
Shadowing: the act of following someone secretly
(tailed) having a tail of a specified kind; often used in combination
Tailings (also known as slimes, tailings pile, tails, leach residue, or slickens) are the materials left over after the process of separating the valuable fraction from the worthless fraction (gangue) of an ore.
(Tailings) The gangue and other refuse material resulting from the washing, concentration, or treatment of ground ore.
(tailings) Residue of raw material or waste separated out during the processing of crops or mineral ores.
(TAILINGS) waste material remaining after metal is extracted from ore.
(Tailings) that portion of the ore from which most of the valuable material has been removed by concentrating and that is therefore low in value and rejected.
(Tailings) The waste material produced from ore after economically recoverable metals or minerals have been extracted. Changes in metal prices and improvements in technology can sometimes make the tailings economic to process at a later date
(Tailings) Material which is left over after the miner has gone through them.