To increase the size, volume, quantity, or scope of; enlarge:
To cause to become greater in size, amount, degree, etc.; add to; augment
To allow (something) to develop or increase by a natural process:
To decrease or limit the scope, extent, or number of
To make (a quantity) smaller.
Restrict is defined as to keep someone or something within certain limits.
To the full extent; completely.
To diversify is defined as to divide up and add variety.
To give a particular character or function to:
Find another word for broaden. In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for broaden, like: widen, expand, increase, grow, narrow, decrease, restrict, extend, wide, diversify and branch-out.