Quadruple VS
Synonym Boundary: "開く", "開通する", "うちとける", "散開星団"
All represent the core concept "open", but require precise selection.
Japanese Option A
開く
あく (aku)
N4 / CEFR
Japanese Option B
開通する
かいつうする (kaitsū suru)
N3 / CEFR
Japanese Option C
うちとける
うちとける (uchitokeru)
N2 / CEFR
Japanese Option D
散開星団
さんかいせいだん (sankaiseidan)
C2 / CEFR
Quadruple VS Nuance Contrast & Social Differences
When expressing "open" in Japanese, you must carefully distinguish between "開く", "開通する", "うちとける", "散開星団" based on context.
- 開く (あく (aku) - Level: N4): Maps to "to open (intransitive)" and is used when Intransitive verb. Used when something opens on its own or is opened by an unspecified agent.
- 開通する (かいつうする (kaitsū suru) - Level: N3): Maps to "to open (for traffic), to be completed (e.g., a tunnel, bridge, line)" and is used when Used for infrastructure like roads, railways, tunnels, or new services becoming available for public use. It's an intransitive verb..
- うちとける (うちとける (uchitokeru) - Level: N2): Maps to "to open one's heart, to feel at home, to relax, to be frank" and is used when Describes the process of becoming comfortable and relaxed with someone, allowing one's true self to show. Often implies breaking down barriers. 心を開き、親しくなる様子を表します。.
- 散開星団 (さんかいせいだん (sankaiseidan) - Level: C2): Maps to "Open cluster" and is used when Essential structural term in CEFR C2 vocabulary syllabus..
Context for "開く"
ドアが自動的に開きます。
The door opens automatically.
Context for "開通する"
新しい高速道路が来月開通する予定だ。
The new highway is scheduled to open next month.
Context for "うちとける"
初めて会った人ともすぐにうちとけることができる。
I can quickly feel at ease even with people I meet for the first time.
Context for "散開星団"
私は散開星団に興味があります。
I am interested in Open cluster.
Synonym Mastery Challenge
Which Japanese word perfectly fits this blank space?
Fill in the blank: "ドアが自動的に開きます。" (Meaning: "The door opens automatically.")
🎉 Correct Answer!
Remember: "開く" is correct here because it represents "to open (intransitive)" in the context: "The door opens automatically.".