Wiktionary
contraction (context Scotland English) (contraction of could not English)
Usage examples of "couldnae".
He had somethin' in his hands - maybe a bowl or somethin', I couldnae see - an' he held it out to t'other man.
You might start tae feel a bit oota things if you couldnae keep up wi' who was shaggin' who back hame.
But the difference now is that I can choose not to do those things, a choice I couldnae make until I'd accepted that the person makin' it was me.
An' the worst part is that he's no happier than when he was outside, starin' in the window at all the things he couldnae have, because at least back then he knew what he wanted - or at least what he thought he wanted.
A' day, I've had my dwelling into the inside of a stack of hay, where I couldnae see the nebs of my ten fingers.
It would be strange, with such a grip as this, if we couldnae squeeze out a pardon for my client.
Ah couldnae hav been lookin whate ah wiz goin coz a giv ma heid a terribil dunt on some ded low doorway.
Now that's information that Everett himself couldnae give you because he ne'er saw the man.
Damned Cabal shamans put up a barrier to keep me outside, so I couldnae help Everett.
So, since I couldnae die in honor an' put me pair soul at peace, I turned back tae the world.