開ける
あける
akeru
= to open something (a door, window, box, bottle, etc.)
Akeru is one of the first verbs learners meet that comes with a built-in trap: it has a grammatical twin that means almost the same thing, and two unrelated homophones spelled with completely different kanji. Getting akeru right means sorting all three apart.
Akeru (開ける) is a transitive verb: it needs someone doing the opening to something. Doa wo akeru means “(someone) opens the door” — a person is acting on the door. Its intransitive partner is aku (開く), used when a thing opens on its own or the focus is on the resulting state rather than the actor: doa ga aku means “the door opens.” The wo/ga swap is the whole grammar of the pair — wo marks the object being acted on, ga marks the subject that changes state. This transitive/intransitive split (aketa/aita, akete/aite) is one of dozens of verb pairs in Japanese built the same way, and akeru-aku is usually the first one taught. Separately, two homophones share the same pronunciation but different kanji and meanings: 空ける (akeru) means to empty or vacate something, as in heya wo akeru (to clear out/free up a room, or to be away from a room), and 明ける (akeru) means for a period of time to end or for day to dawn, as in yoru ga akeru (night ends, day breaks) or toshi ga akeru (the year turns/begins). All three are written and conjugate identically in speech (aketa, akete) but are distinguished entirely by kanji and context in writing.
The single biggest trap for beginners: reaching for akeru when aku is needed, or vice versa. If a person is doing the opening, use akeru with wo (mado wo akete kudasai, “please open the window”). If you’re describing that something opens or is already open with no actor mentioned, use aku with ga (mise ga aku, “the store opens”). Second trap: the three-way kanji homophone. 開ける = open (a door/box), 空ける = empty/vacate/free up (a room, a schedule slot, a seat), 明ける = a period ending or dawning (night, a year, a rainy season). Context and the object almost always disambiguate them, but they trip up learners reading without furigana. A fun anchor for the third one: the New Year’s greeting akemashite omedetou gozaimasu literally uses 明ける — “congratulations on [the year] having opened/dawned.” That’s the same akeru sound as the door verb, but a totally different word.
Everyday use
毎朝、起きたらまずカーテンを開けます。
Maiasa, okitara mazu kaaten wo akemasu.
Every morning, the first thing I do after waking up is open the curtains.
Casual / Social Media
窓開けてもいい？ちょっと暑くて。
Mado akete mo ii? Chotto atsukute.
Mind if I open the window? It’s a bit hot.
Formal / Cultural context
恐れ入りますが、こちらの扉は係員が開けますので、そのままお待ちください。
Osoreirimasu ga, kochira no tobira wa kakariin ga akemasu node, sono mama omachi kudasai.
We apologize for the inconvenience, but a staff member will open this door, so please wait as you are.
In Japan, doors and gates carry more ceremony than a simple mechanical action. At shrines, the opening of the honden (main hall) doors for a festival, or the ritual opening of a sake barrel (kagami biraki) at celebrations, both use forms of akeru/hiraku to mark a threshold moment, not just a physical motion. The verb’s connection to “beginning” is not accidental: the homophone 明ける (a period ending/dawning) and 開ける (to open something) sit right next to each other in the language’s imagination, which is why New Year’s greetings, the end of the rainy season (tsuyu ga akeru), and the opening of a door all cluster around the same sound.
Business and service settings in Japan also encode a lot of etiquette into who is allowed to akeru what. Staff, not customers, typically open taxi doors, hotel room doors, and certain shop entrances as a mark of hospitality (omotenashi) — a customer reaching to open such a door themselves can read as declining that care. Understanding akeru as “the transitive act of opening, performed by someone for someone” makes this small but noticeable cultural pattern easier to recognize when traveling or living in Japan.