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)))))))))))) (. .)))
Corroboration is readily forthcoming from the OED.
( Corroboration ( ( is ( readily ( forthcoming ( from ( the OED ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Corroboration)) (VP (VBZ is) (ADJP (RB readily) (JJ forthcoming) (PP (IN from) (NP (DT the) (NNP OED))))) (. .)))