mas.se.khah denotes a covering or veil, pictured as spread over peoples and as too narrow for one gathered beneath it.

The two occurrences portray mas.se.khah as a covering: one spread over peoples and nations, and one too narrow when a person gathers beneath it.

1. A covering spread over or enclosing · dominant

   Both occurrences use the same feminine singular absolute noun for a covering. In Isaiah 25:7 the APB renders a covering that covers all peoples and a veil woven upon all nations; in Isaiah 28:20 it renders a covering too narrow when one gathers oneself.

   Isaiah 25:7Isaiah 28:20

In the Anselm Project Bible: The APB uses both “covering” and “veil” in Isaiah 25:7, and “covering” in Isaiah 28:20. These words present the clauses' imagery rather than a fixed individual rendering.