Might nigh old-fashioned phrase informal colloquial
Almost; nearly; very close to.
She fell and might nigh broke her neck. Instead of going all together, let's visit her individually.
The alley was too slippery, so the old man might nigh made a false step
Might nigh 100 people died in the plane crash.
Be very nearly or inevitably lost, departed or deceased
One very nearly achieved or got something, but in the end you just failed, or there is still some difficulty to do before that can happen.
Nearly accurate or correct