To prevent from entering; to block or exclude.
His wife shut him out of his own house.
To hide from sight.
The high wall shut out the countryside beyond.
To prevent from scoring; to perform a shutout.
Closing and forbidding entry, as a lockout in which management prevents works from working.
A shutout is a reverse strike: the union complained and the workers wanted to work, but management was opposed.
A game that ends with one side not having scored.
The score wasn't just lopsided: it was a shutout.