Hypertext Webster Gateway: "unhorse"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Unhorse \Un*horse"\, v. t. [1 st pref. un- + horse.]
To throw from a horse; to cause to dismount; also, to take a
horse or horses from; as, to unhorse a rider; to unhorse a
carriage. --Cowper.
From WordNet (r) 1.7 (wn)
unhorse
v : get off (a horse) [syn: {dismount}, {light}, {get off}, {get
down}]
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