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The Collaborative International Dictionary
Disseizing

Disseize \Dis*seize"\, v. t. [imp. & p. p. Disseized; p. pr. & vb. n. Disseizing.] [Pref. dis- + seize: cf. F. dessaisir.] (Law) To deprive of seizin or possession; to dispossess or oust wrongfully (one in freehold possession of land); -- followed by of; as, to disseize a tenant of his freehold. [Written also disseise.]

Which savage beasts strive as eagerly to keep and hold those golden mines, as the Arimaspians to disseize them thereof.
--Holland.

Wiktionary
disseizing

vb. (present participle of disseize English)