Vocabulary

ਇਜ਼ਹਾਰ
izhaar

a formal declaration or confession of love — from Persian/Urdu (اظہار). Not casual. This was THE confession, the definitive one, and it never came.

noun
In this song
Avengi Ja Nahin · Rabbi Shergill
Verse 3
ਜਿਹੜਾ ਹੋਇਆ ਨਾ ਸੀ ਓਸ ਇਜ਼ਹਾਰ ਦਾ
jehra hoya na ci os izhaar da
That confession of love that never happened?