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The Collaborative International Dictionary
Damage feasant

Damage feasant \Dam"age fea`sant\ [OF. damage + F. faisant doing, p. pr. See Feasible.] (Law) Doing injury; trespassing, as cattle.
--Blackstone.

Wiktionary
damage feasant

n. (context legal English) The doing of damage; in particular, the doing by animals such as cattle of damage by trespassing.