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Definition of broaden : 1. To grow broad; to become broader or wider.
2. To make broad or broader; to render more broad or comprehensive.

Synonyms:

strain, offer, wide, let out, take in, force a smile/laugh, pass, stretch out, radiate, smirk, bur, simper, branch out, accent, collapse, grin, add on, involve, unfold, gallop, beam, incorporate, cover, reach out, put out, count in, burr, hold out, crack a smile, lead, include, grin/smile from ear to ear, carry, embrace, smile thinly, cut-glass, diversify, smile, accented, open out, broad, brogue, build in, continue, run, prolong, poke out, flare, protract, narrow, go, exsert, stretch forth, raise a smile, draw out, drawl

stretch, engorge, swell, thicken, distend, spread, dilate, develop

enlarge, increment, raise, magnify, upgrade, elevate, augment, heighten, multiply, accrue, reinforce, extend, increase, expand, advance, inflate, boost, maximize, grow, burgeon, fatten, widen, amplify, add, lengthen

Usage examples:

• Many things had happened to broaden Eugenia's point of view since her arrival in Europe to act as a Red Cross nurse. - "The Red Cross Girls with the Russian Army", Margaret Vandercook.
• The dream was then of the coloured days to come; now she was more infant in her mind, and she watched the scattered water broaden, and tasted the spray, sat there drinking the scene, untroubled by hopes as a lamb, different only from an infant in knowing that she had thrown off life to travel back to her home and be refreshed. - "The Short Works of George Meredith", George Meredith Last Updated: March 7, 2009.
• I believe in the cooperation of the national authority to stimulate, encourage, and broaden the work of the local authorities. - "Complete State of the Union Addresses from 1790 to the Present", Various.