ride on someone's/something's coat-tails

ride on (one's) coattails

To benefit from someone else's success; to use someone else's success as a means to achieve one's own. Everyone knows you've been riding on the governor's coattails for the last two years, but once her term ends you'll be on your own. Jonathan rode on the famous professor's coattails to get some recognition for his own work from several esteemed academic journals.
See also: coattail, on, ride
Farlex Dictionary of Idioms.

ride on someone's/something's coat-tails

or

ride someone's/something's coat-tails

If someone or something rides on someone or something else's coat-tails, they use that person or thing's success to get success for themselves. Note: `Coat-tails' is usually written as `coattails' in American English. Frank did all the work and I rode on his coat-tails. Essentially, we're riding the coattails of the big companies to get new customers. Note: Coat-tails is used in many other structures connected with getting an advantage from someone or something else. The Canadian dollar rode the coattails of the U.S. dollar yesterday. They had come to power on the coat-tails of a popular general whose views on public questions they then ignored.
See also: on, ride
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • ride (one's) coattails
  • ride on (one's) coattails
  • ride on coattails
  • ride (on) the coattails of (someone)
  • on the coattails of
  • on the coattails of (someone)
  • on the coat-tails of someone/something
  • on (one's) coattails
  • on somebody's coat-tails
  • on someone's coat-tails