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slip-rail

ˈslip-rail Austr.
  [slip- 1 b.]
  A fence-rail, forming one of a set which can be slipped out so as to leave an opening. Chiefly pl. Also attrib.

1828 Cunningham N.S. Wales II. 171 These patches might..communicate with the fields by means of slip-rail entrances. 1852 Mundy Antipodes (1857) 198 The greater part of our route lay through bush-roads.., through scores of slip-rails—the primitive gate of Australia, and along the bush-ranges. 1885 Mrs. Praed Austral. Life 79 Many men rode thro' the slip-rails and turned out their horses.

Oxford English Dictionary

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