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defease

[dih-feez]
verb (used with object), de·feased, de·feas·ing.
  1. to defeat or annul (a contract, deed, etc.).
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Origin of defease

First recorded in 1470–80; back formation from defeasance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018