Meanings (ES + gloss)
abjurar
To renounce (something) upon oath; to forswear; specifically, to recant or retract (a heresy or some other opinion); to withdraw.
[W]hen, guided by learned rabbis, invincible generals, and sublime and enlightened heathens, thou in evil hour abjuredst the gospel, in outward act if not in heart, and ungratefull…
to abjure allegiance to a prince