開(あ)く

あく

verb (godan)

to open (by itself)

1. to open, to become open

For something to move from a closed to open position on its own. The intransitive pair of 開(あ)ける.

ドアが開(あ)きました。

The door opened.

店(みせ)は何(なん)時(じ)に開(あ)きますか。

What time does the store open?

窓(まど)が開(あ)いています。

The window is open.

電車(でんしゃ)のドアが開(あ)くまで待(ま)ってください。

Please wait until the train door opens.

花(はな)が開(ひら)くのを見(み)るのが好(す)きです。

I like watching flowers open.

Here 開く uses alternative reading ひらく for blossoming

TRANSITIVITY: 自動詞(じどうし) (intransitive). Pair: 開(あ)ける (transitive, to open something). Pattern: Xが開(あ)く.

ASPECT: ている indicates resulting state. 開(あ)いている = 'is open' (not 'is opening'). This is important: 窓(まど)が開(あ)いている means 'the window is open,' not 'the window is opening.'

COMMON PATTERNS:

ドアが開(あ)く (the door opens)
店(みせ)が開(あ)く (the store opens)
穴(あな)が開(あ)く (a hole forms)
席(せき)が開(あ)く (a seat becomes available)

Opposite: 閉(し)まる (to close by itself).

開(あ)く

Related Words