Meaning
Again and again; repeatedly.
How Iqbal uses it
Reduplication of 'baar' (time/instance).
See it in the verse
baar-baar in Iqbal’s couplets
Gulzar-e-hast-o-bud na begana-war dekh
Hai dekhne ki cheez ise bar bar dekh
Hai dekhne ki cheez ise bar bar dekh
Do not look at the garden of existence like a stranger — it is a thing worth seeing; look at it again and again.
Awakening · Hope · Self-Knowledge
Baatil se dabne wale ai aasman nahin ham
Sau baar kar chuka hai tu imtihan hamara
Sau baar kar chuka hai tu imtihan hamara
We are not the kind to be crushed by falsehood, O sky; a hundred times already you have tested us.
Courage · Adversity