1
Law::
(of an instrument or its validity) be defeated (‘conditional legacy’ [is] a bequest whose operation depends upon the happening or not happening of some uncertain event, upon which it is either to take effect or to be defeated – JBS( ( ‘defeasance’ [is a] collateral deed, made at the same time with a feoffment or other conveyance, upon the performance of which the estate then created may be defeated or totally undone – JBS(
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