A respectful title for a nobleman and landowner:Brigadier Thakur Jabar Singh...
Om Puri is the tyrannical thakur while Dutt is a low-caste labour in the thakur's farm.
But the prize comment comes from Mahesh Panpalia: ‘Tomorrow if a thakur offers me water from the same pitcher, I'd be so stunned I wouldn't know what to do.’
Origin
From Hindi ṭhākur 'lord', from Sanskrit ṭhakkura 'chief, lord'.