Webster’s Revised Unabridged Dictionary · 1913
Broaden
Broad′en (·'n), v. t. [imp. & p. p. Broadened; p. pr. & vb. n. Broadening.] [From Broad, a.] To grow broad; to become broader or wider.
The broadening sun appears. Wordsworth.
Broad′en, v. t. To make broad or broader; to render more broad or comprehensive.