What is the past participle of bint?

The word "bint" is not a verb, so it does not have a past participle. It is a slang term, often considered offensive, for a young woman or girl.

If you are looking for a related word with a past participle, perhaps you meant "bind" or "bite," both of which are verbs.

* Bind - Past participle: bound

* Bite - Past participle: bitten