What is a cross offer?

A cross offer is one where both parties state to each other the same proposal.

e.g. If A tells B - "Will you buy my red car for Rs. 5,00,000?"

But B, unaware of the A's proposition at that time, also goes ahead and says - "Will you sell me your red car for Rs. 5,00,000?"

In this way, anyone can accept the offer.

This is not to be confused with a counter-offer.

Example of counter offer - A tells B "Will you buy my red car for Rs. 5,00,000?"

But B says simultaneously - "Will you sell me your red car for Rs. 4,50,000?"