We may as well try; another author on the subject.
Dr. Sued Zafar Haider, Islamic Arms and Armour of Muslim India. On page 176 the author writes. Tegha. I was a sword with a broad and very deep curved blade, deeper than shamshir and mounted with an Indo-Muslim hilt. It could be differentiated from the tulwar by its broad and deeply curved blade.
Whatever it is called Bill, it is still a very nice sword you have
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