solidify
Definition
To make or become solid; to strengthen or consolidate something, such as an agreement or relationship.
हिन्दी ठोस बनाना या बन जाना; किसी चीज़ जैसे कि समझौते या संबंध को मजबूत या सुदृढ़ करना।
Example
"The alliance between the two nations began to solidify after years of negotiation."