Yap.Town

を広げる

to spread out; to broaden or expand

→ を
phrase Uncommon #16,837
to spread out; to broaden or expand を marks the object being spread or expanded. 広げる can describe physically opening or spreading something, as well as broadening knowledge or expanding territory.
JA: テレビは私たちの知識を広げる。
EN: Television broadens our knowledge.

大学教育は知識を広げるためのものだ。

University education is meant to broaden one's knowledge.

よい映画は人の視野を広げる。

Good movies broaden people’s horizons.