Longman Dictionary of Contemporary English - broaden

~ v 1 to increase something such as knowledge, experience, or your range of activities  (Broaden your knowledge of English with this book. | broaden your horizons (=increase your activities and opportunities)) 2 to make something broader or to become broader  (The road broadened into an imposing avenue.) 3 broaden your mind if an experience broadens your mind, it makes it easier for you to accept other people's beliefs, ways of doing things etc  (Travel broadens the mind.) broaden out phr v to gradually become wider  (The river broadens out at this point.)