References in classic literature ?
Arobin had put on his coat, and he stood before her and asked if his cravat was plumb.
Grose who first brought up the plumb with an almost elated "You see
No, when I go to sea, I go as a simple sailor, right before the mast, plumb down into the forecastle, aloft there to the royal mast-head.
Oh, she was plumb deef en dumb, Huck, plumb deef en dumb -- en I'd ben a- treat'n her so
He laid dah moanin' en cussin', en all out of his head, you know, en de niggers 'uz plumb sk'yred to death.
He never made any bones about his own case; said he'd been a hard lot, was a hard lot yet, and reckoned he'd be a hard lot plumb to the end.