one of a horizontal set of fence rails that can be removed easily to leave a gateway.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use slip-rail in a sentence
Not very far off there was a lean horse standing, but he didn't seem to like to come through the slip-rail o' the paddock fence.Station Amusements | Lady Barker
British Dictionary definitions for slip rail
Australian and NZ a rail in a fence that can be slipped out of place to make an opening
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012