cornerstone

Pezeshkian emphasised that Iran stood “firmly alongside the Syrian government and people”, and that preserving Syria’s sovereignty and territorial integrity was a cornerstone of its regional strategy.

With its solid bottom and flexible sides, the RIB has become a cornerstone of modern boating, with use for leisure, by the military and, crucially in life-saving.

In an online petition objecting to the closure, opponents said "the department has long been a cornerstone of Hull's educational and research heritage".

A store described as the "cornerstone" of a region's musical heritage for more than 100 years has "closed permanently".

Gold has been a cornerstone of Indian Ayurvedic treatments for centuries, celebrated for its healing properties.