Closed means not open — nothing goes in or out. The shop is closed, a closed door, the road is closed.
Of a business it means not trading now; of a road, blocked. Closed also means finished as a matter: the case is closed. A closed group is one outsiders cannot join, and behind closed doors means in private, away from the public. Note closed-minded, meaning unwilling to consider new ideas, and that closed captions are subtitles you switch on. The opposite is open in every one of these senses.
1adjectiveclosedNot open; shut so that nothing goes in or out.
“The road has been closed since the storm.”
synonyms: shut
2adjectivetradingNot trading or operating.
“Everything is closed on a Sunday here.”
3adjectivefinishedFinished, of a matter.
“As far as she was concerned the case was closed.”
Too few real examples of this word to estimate which sense is commonest.
closed is a state of being shut.
Also accepted in games: shut