Chabahar is a strategic port in Iran. Pakistan’s refusal to transit wheat from India to the beleaguered Afghanistan resulted in India, transporting goods from Chabahar. As an idiom it means entering goods into battle weary country through an exit point when the same is denied by a neighboring country.
Example: India’s goodwill gesture to Afghanistan resulted in a Chabahar.
During the Berlin blockade America became a Chabahar through the conduct of operation vittles.