To make or become broad or broader
To make or become more comprehensive or inclusive
To make wider
To become wider
Then with great labor he began to widen the passageway.
He did much to widen the national church.
"Widen your stance," he instructed, and nudged her left leg out farther with his own.
strict application to technical "clerks," and to widen it out so as to embrace all varieties of ordained Christian ministers.