sliding seat
noun
: a rower's seat (as in a racing shell) that slides fore and aft
called also slide
Example Sentences
Recent Examples on the Web Mid-race, her partner fell off his sliding seat in the boat. 
Bethany Ericson, The Christian Science Monitor, 13 Oct. 2021 The decision to limit the smart slide seat to the passenger side is perplexing but a small fault in an excellent family vehicle that looks just a bit tougher and more capable than most of its competitors. Mark Phelan, USA TODAY, 1 Sep. 2017
Bethany Ericson, The Christian Science Monitor, 13 Oct. 2021 The decision to limit the smart slide seat to the passenger side is perplexing but a small fault in an excellent family vehicle that looks just a bit tougher and more capable than most of its competitors. Mark Phelan, USA TODAY, 1 Sep. 2017 Word History
First Known Use
1874, in the meaning defined above