大開眼界

Big; large; great; vast; elder; eldest; important; profound; to a great extent; to emphasize; (dialect) father or uncle.

To open or unfasten; to start or begin; to operate a vehicle or machine; to turn on; to write out; to bloom; to boil; to launch; to discover.

Eye; a look or glance; a hole or opening; classifier for wells; a key point or salient feature; a vacant spot in Go.

Boundary; border; limit; a specific scope or domain; the world; a realm or classification level; to divide or separate.