1To be open or to lead (to); a road, line, or route connects to a place so people or vehicles can pass or reach it.
この道は港まで通じている。
This road leads to the port.
新しい高速道路ができて、市内と郊外が通じるようになった。
A new highway opened, connecting the city and the suburbs.
この橋は工事中で車が通じない。
This bridge is under construction, so cars can't get through.
2To flow or pass through (liquid, current, air); to run through a channel or passage to the other side.
古いパイプが詰まっていて水が通じない。
The old pipe is clogged, so water won't flow through.
この川はこの湖を通じて海に出る。
This river flows through this lake and out to the sea.
3To be understood or comprehended by someone; for one's meaning or words to get across.
簡単な英語なら、向こうの人にも通じると思う。
I think simple English will be understood by the people there.
何度説明しても彼には通じなかった。
No matter how many times I explained, he didn't get it.
ジェスチャーだけで意思が通じた。
We got our meaning across using just gestures.
4To carry weight or standing because one's reputation is widely known; a somewhat old-fashioned use, often seen in phrases like 'his name is known.'
彼は業界では名が通じる存在だ。
He's a figure whose name carries weight in the industry.
5To be well versed in or knowledgeable about a field.
彼女はIT業界に詳しく、技術に通じている。
She knows the IT industry well and is well versed in technology.
経済に通じている人の意見を聞きたい。
I'd like to hear the opinion of someone knowledgeable about economics.
年配の社員は業務の細かいところまで通じている。
The senior employees are familiar with even the fine details of the work.
6To communicate clandestinely with an enemy or opposing party, implying secret collusion; a somewhat formal, literary use.
彼は敵国と通じていた疑いで逮捕された。
He was arrested on suspicion of secretly communicating with the enemy nation.
7To form a close, often improper or secret, connection with someone; implies an intimate or collusive tie others aren't meant to know about.
あの会社は行政と通じて有利な契約を得たと言われている。
That company is said to have had close ties with the administration and secured a favorable contract.
8To spread widely and become disseminated (information, reputation, trends).
新商品の評判はネットで瞬く間に通じた。
Word of the new product's reputation spread across the internet in no time.
このやり方は若者の間に通じつつある。
This method is spreading among young people.