A thin hollow neck (in a horse).

1

1820.  W. Irving, Sketch-bk. Sleepy Hollow (1887), 410. A broken-down plough-horse … with a ewe neck, and a head like a hammer.

2

1856.  ‘Stonehenge,’ Brit. Sports (ed. 3), 322. Between the two extremes of the ewe-neck and its opposite there are many degrees.

3

  Hence Ewe-necked a.

4

1704.  Lond. Gaz., No. 45. 18/4. A grey Mare … Ewe-Neck’d.

5

1840.  Barham, Ingol. Leg., Grey Dolphin. His dapple-grey steed … was a little ewe-necked.

6

1858.  O. W. Holmes, Aut. Breakf.-t., 298.

        Here comes the wonderful one-horse-shay,
Drawn by a rat-tailed, ewe-necked bay.

7

1878.  Cumberld. Gloss., Yowe neck’t, the arch of the neck bending downwards.

8