What is the difference between "病気になる", "独立する", "かじかむ", "痩せこける"?

"病気になる" means "to become sick; to get ill", "独立する" means "to become independent; to stand alone", "かじかむ" means "to become numb with cold; to be benumbed with cold (e.g. hands)", "痩せこける" means "to become very thin, to become emaciated, to be gaunt".

Quadruple VS

Synonym Boundary: "病気になる", "独立する", "かじかむ", "痩せこける"

All represent the core concept "become", but require precise selection.

Japanese Option A

病気になる

びょうきになる (byōki ni naru)

N4 / CEFR

Japanese Option B

独立する

どくりつする (dokuritsusuru)

N3 / CEFR

Japanese Option C

かじかむ

かじかむ (kajikamu)

N2 / CEFR

Japanese Option D

痩せこける

やせこける (yasekokeru)

N2 / CEFR

Quadruple VS Nuance Contrast & Social Differences

When expressing "become" in Japanese, you must carefully distinguish between "病気になる", "独立する", "かじかむ", "痩せこける" based on context.

病気になる (びょうきになる (byōki ni naru) - Level: N4): Maps to "to become sick; to get ill" and is used when 「病気」は名詞で、「〜になる」は状態の変化を表す動詞です。健康な状態から病気の状態へ変わることを指します。.
独立する (どくりつする (dokuritsusuru) - Level: N3): Maps to "to become independent; to stand alone" and is used when Used when a country gains sovereignty, an individual becomes self-reliant and lives apart from their family, or an organization/unit operates autonomously..
かじかむ (かじかむ (kajikamu) - Level: N2): Maps to "to become numb with cold; to be benumbed with cold (e.g. hands)" and is used when Specifically describes the sensation of hands or fingers becoming stiff and difficult to move due to cold. It implies the cold has made them numb or clumsy..
痩せこける (やせこける (yasekokeru) - Level: N2): Maps to "to become very thin, to become emaciated, to be gaunt" and is used when To become extremely thin, often to an unhealthy degree, due to illness, hardship, lack of food, or stress. It implies a noticeable and often skeletal appearance. 病気や苦労、食事不足などにより、極度に痩せて骨ばった状態になることを指す。健康的な痩せ方ではない、というニュアンスがある。.

Mixing these up can easily lead to unnatural translations. Refer to the bilingual context cards below to master the boundaries!

Context for "病気になる"

熱があって、病気になりました。

I had a fever and became sick.

Context for "独立する"

彼は大学を卒業後、実家から独立した。

After graduating from university, he became independent from his parents' home.

Context for "かじかむ"

寒さで指がかじかんで、うまく字が書けない。

My fingers are numb with cold, so I can't write well.

Context for "痩せこける"

病気で彼はすっかり痩せこけてしまった。

He became completely emaciated due to his illness.

Synonym Mastery Challenge

Which Japanese word perfectly fits this blank space?

Fill in the blank: "熱があって、病気になりました。" (Meaning: "I had a fever and became sick.")

🎉 Correct Answer!

Remember: "病気になる" is correct here because it represents "to become sick; to get ill" in the context: "I had a fever and became sick.".