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The British were in a tough position in the early 1780s, as they had to fight the Marathas and Mysore at the same time.
Now say everything goes wrong for them.
- The Maratha plan to raid Bengal is carried out
- There is a famine and a large revolt in Bengal
- Peace with the French is delayed
So to protect Bengal the English divert forces away from the rest of India. This + continued and large-scale French involvement means the Marathas and Mysore both decisively win. Maybe the English even lose parts of Bengal to the Marathas.