† to-deraignv. (also to-dreyn) [deraignv.1] Obsolete to maintain, vindicate (a cause, etc.) entirely.
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society > morality > duty or obligation > moral or legal constraint > immunity or exemption from liability > justification > justify [verb (transitive)] > vindicate
to-deraignc1320
justifya1382
wreakc1400
vindicate1641
c1320 Cast. Love 974 For I chulle an ende ouercome þt fiht, And to-dreynen al þi riht.