大开眼界

大開眼界
dàkāiyǎnjiè
(idiom) to broaden one's horizons greatly

CEDICT

eye-opening; able to broaden one's horizon

Wiktionary

增加见识，开阔视野。

重編國語辭典

让视野开展，见闻增加

維基詞典

Entry Composition

1 大开 dàkāi to open wide
2 眼界 yǎnjiè (lit. and fig.) field of vision; scope; horizon