Artificial intelligent assistant

swing-tree

swing-tree
  (ˈswɪŋtriː)
  = swingletree 2.

1396–7 Durham Acc. Rolls (Surtees) 214, iiij harpice cum iij Swyngtreys ferreis. 1802 James Milit. Dict., Swing⁓tree of a waggon. 1812 Sir J. Sinclair Syst. Husb. Scot. ii. App. 46 The..swing-trees, to which the horses are attached when ploughing. 1883 Jefferies Nature near Lond. 86 The traces are taut, the swing-tree like a yard braced square.

Oxford English Dictionary

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