Meaning
Colloquial: a spectacle, a scene; 'tamasha banana' = to make a public scene.
See it in the verse
Tamasha in Iqbal’s couplets
Be-khatar kud pada aatish-e-Nimrood mein ishq
Aql hai mahv-e-tamasha-e-lab-e-baam abhi
Aql hai mahv-e-tamasha-e-lab-e-baam abhi
Love leapt fearlessly into the fire — while reason still stood on the rooftop's edge, lost in watching the spectacle.
Courage · Love · Action
Zahir ki aankh se na tamasha kare koi
Ho dekhna to dida-e-dil va kare koi
Ho dekhna to dida-e-dil va kare koi
Let no one watch the spectacle with the outward eye alone; if you would truly see, open the eye of the heart.
Self-Knowledge · Awakening