Corroboration is not readily forthcoming from the OED, unless we accept a citation from Lydgate, dated c 1450: Pryd gothe beforen And schame comythe aftyr, and blawythe horne.
( Corroboration ( ( ( ( ( is not ) ( readily ( forthcoming ( from ( the OED ) ) ) ) ) , ) ( unless ( we ( ( ( ( accept ( a citation ) ) ( from Lydgate ) ) , ) ( dated ( ( ( ( c 1450 ) ( : ( Pryd ( gothe beforen ) ) ) ) And ) ( ( ( ( schame ( comythe aftyr ) ) , ) and ) ( blawythe horne ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Corroboration)) (VP (VBZ is) (RB not) (ADJP (RB readily) (JJ forthcoming) (PP (IN from) (NP (DT the) (NNP OED)))) (, ,) (SBAR (IN unless) (S (NP (PRP we)) (VP (VBP accept) (NP (DT a) (NN citation)) (PP (IN from) (NP (NNP Lydgate))) (, ,) (ADJP (JJ dated) (SBAR (S (S (VP (X (X (SYM c)) (NP (CD 1450))) (: :) (VP (VBN Pryd) (NP (JJ gothe) (NN beforen))))) (CC And) (S (VP (VP (VB schame) (NP (JJ comythe) (NN aftyr))) (, ,) (CC and) (VP (VB blawythe) (NP (NN horne)))))))))))) (. .)))
We must accept a citation from Lydgate, to get corrobortion from the OED.
( We ( ( must ( ( ( ( accept ( a citation ) ) ( from Lydgate ) ) , ) ( to ( ( get corrobortion ) ( from ( the OED ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (MD must) (VP (VB accept) (NP (DT a) (NN citation)) (PP (IN from) (NP (NNP Lydgate))) (, ,) (S (VP (TO to) (VP (VB get) (NP (NN corrobortion)) (PP (IN from) (NP (DT the) (NNP OED)))))))) (. .)))