つまり: In Other Words / That Is | Japanese Grammar

Most connectors in this group push the discourse forward — they add a point, draw a consequence, change the subject. つまり does the opposite: it points backward. It takes something already said and repackages it into a clearer, shorter, or more pointed form — "in other words, that is to say, in short." It adds no new information; it recasts existing information. That single property governs everything about how つまり behaves: if there is no prior statement to distill, つまり has nothing to do. It is the guide's dedicated tool for "so what this really means is...".

Restating: "in other words"

The core job is paraphrase — say the same thing again, but sharper. The listener has the facts; つまり hands them the interpretation.

彼は誘っても来なかった。つまり、断ったんだよ。

kare wa sasotte mo konakatta. tsumari, kotowatta n da yo

He didn't come even when invited. In other words, he turned us down.

出発は五時だ。つまり、あと一時間しかない。

shuppatsu wa go-ji da. tsumari, ato ichi-jikan shika nai

We leave at five. In other words, we've only got an hour left.

Nothing new enters in the second clause — "he turned us down" and "only an hour left" are just the first fact, restated in the terms that matter. That is the test of a good つまり: strip the second clause and no fact is lost, only the interpretation.

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Ask: is the clause after つまり the same information in sharper form, or a new fact? If it's the same information recast, つまり is right. If it's genuinely new, you want an additive (さらに, また) — つまり cannot introduce new content.

Summarizing: drawing the upshot

The same backward pointing lets つまり sum up a longer stretch — several facts distilled into one conclusion. Here it means "in short / the bottom line is."

売上は落ち、赤字も続いた。つまり、経営は失敗したのだ。

uriage wa ochi, akaji mo tsuzuita. tsumari, keiei wa shippai shita no da

Sales dropped and losses continued. In short, the management failed.

In speech, つまり even works as a prompt: you can ask someone to give you the upshot of what they have been saying.

つまり、何が言いたいの？

tsumari, nani ga iitai no

So — what are you trying to say?

The 〜ということだ pairing

Because つまり restates a whole idea, it very often closes with 〜ということだ ("it means that... / that is to say"), the construction that packages an entire proposition as a conclusion. The frame つまり…ということだ is the textbook shape of a formal restatement: つまり opens the recast, and ということだ seals it as "the meaning of all this is that...".

予算が下りなかった。つまり、今年は実行できないということだ。

yosan ga orinakatta. tsumari, kotoshi wa jikkō dekinai to iu koto da

The budget wasn't approved. In other words, it means we can't carry it out this year.

That ということだ tail is the 〜ということ construction — it nominalizes the whole restated proposition and presents it as the takeaway. You do not have to use it (the earlier examples close on a plain predicate), but when the thing you are distilling is a full claim, ということだ is the idiomatic way to land it.

つまり、これが失敗の原因だったということだ。

tsumari, kore ga shippai no gen'in datta to iu koto da

In other words, this is what caused the failure.

つまり vs だから: recast vs conclude

English speakers often blur つまり with the causal "so." They feel similar because both can precede a wrap-up clause, but they do different work. だから ("so, therefore") draws a causal consequence — B follows because of A. つまり states an equivalence — B is A, said better. One is A → therefore B; the other is A, i.e. B.

今日は祝日だ。だから、銀行は休みだ。

kyō wa shukujitsu da. dakara, ginkō wa yasumi da

Today is a holiday. So the bank is closed. (cause → effect)

今日は祝日だ。つまり、どこも混んでいるということだ。

kyō wa shukujitsu da. tsumari, doko mo konde iru to iu koto da

Today is a holiday. In other words, everywhere will be crowded. (restated interpretation)

If B is a result caused by A, use だから. If B is A re-described, use つまり.

Register and near-synonyms

つまり is register-neutral — equally at home in conversation and writing. Its cousins split by register: 要するに（ようするに） means "to sum up / in short" and can carry a faint "let me cut to the chase" impatience; すなわち is a formal, written "namely / that is" used in academic and legal prose; 言い換えれば（いいかえれば） is "put another way." All share the backward-pointing, restating function of つまり.

すなわち、需要と供給が一致する点である。

sunawachi, juyō to kyōkyū ga icchi suru ten de aru

That is, it is the point where supply and demand meet. (formal/academic)

Common mistakes

Mistake 1 — Using つまり to add new information. つまり can only recast what is already there; a new fact needs an additive.

❌ 彼は医者だ。つまり、弟は弁護士だ。

Wrong — the brother's job is a new, separate fact, not a restatement of 'he is a doctor.' Use また / さらに for a new point.

✅ 彼は医者だ。また、弟は弁護士だ。

kare wa isha da. mata, otōto wa bengoshi da

He is a doctor. Also, his younger brother is a lawyer.

Mistake 2 — Using つまり where a causal 'so' is meant. A caused result is だから; つまり states an equivalence, not a consequence.

❌ 雨が降った。つまり、試合は中止だ。

Off — the cancellation is a consequence caused by the rain, not a restatement of it. Use だから for cause → effect.

✅ 雨が降った。だから、試合は中止だ。

ame ga futta. dakara, shiai wa chūshi da

It rained. So the game is cancelled.

Mistake 3 — Using つまり with no prior statement to distill. つまり must point backward; opening a fresh idea with it leaves it dangling.

❌（話の冒頭で）つまり、明日は会議があります。

Wrong — nothing has been said yet, so there is nothing to restate. Just state the fact directly.

✅ 明日は会議があります。

ashita wa kaigi ga arimasu

There's a meeting tomorrow.

Mistake 4 — Forgetting ということだ when distilling a full claim. In careful writing, a restated proposition idiomatically closes with ということだ; a bare だ can read as abrupt.

❌ 返事が来ない。つまり、脈がない。

Curt in writing — when distilling a whole proposition, close with ということだ to land the conclusion cleanly.

✅ 返事が来ない。つまり、脈がないということだ。

henji ga konai. tsumari, myaku ga nai to iu koto da

There's no reply. In other words, there's no chance.

Key takeaways

つまり restates; it never adds. It repackages an existing statement into a sharper, shorter form — "in other words, in short."
It points backward: with no prior statement to distill, つまり has nothing to do.
It commonly closes with 〜ということだ, which packages the whole proposition as the takeaway.
Not だから: つまり states an equivalence (A, i.e. B); だから draws a consequence (A, therefore B).
Register-neutral; formal cousins are すなわち (written "namely") and 要するに ("to sum up").

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