Webster’s Revised Unabridged Dictionary · 1913
Widen
Wid′en (wīd′'n), v. t. [imp. & p. p. Widened; p. pr. & vb. n. Widening.] To make wide or wider; to extend in breadth; to increase the width of; as, to widen a field; to widen a breach; to widen a stocking.
Wid′en, v. i. To grow wide or wider; to enlarge; to spread; to extend.
Arches widen, and long aisles extend. Pope.