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to open (e.g. doors)
to open (e.g. business, etc.)
to be empty
to be vacant; to be available; to be free
to be open (e.g. neckline, etc.)
to have been opened (of one's eyes, mouth, etc.)
to come to an end
to open (one's eyes, mouth, etc.)
to have a hole; to form a gap; to have an interval (between events)
「開く」 has another reading with different meanings.
ドアが自動で開いた。
The door opened automatically.
目が開かないくらい眠い。
So sleepy can't open eyes.
クリアな音が部屋に響く。
A clear sound echoes in the room.