Translation guide
In Japanese, expressing tautology (saying the same thing twice in different words) is often avoided in formal writing but can be used for emphasis, clarification, or stylistic effect in casual speech. This guide covers common patterns for redundant expressions, logical tautologies, and rhetorical repetition.
The speaker uses two words or phrases that mean essentially the same thing, often for emphasis or out of habit.
A pattern meaning 'A is A', used to state an obvious truth or identity. It can sound tautological but is natural in Japanese for emphasis or resignation.
A promise is a promise.
Facts are facts.
Used to say 'A is also A', often implying that something is typical or expected, sometimes with a nuance of criticism or resignation.
He's just being himself. (That's just how he is.)
Literally 'to repeat the same thing', used to point out tautology in speech or writing.
His explanation is just repeating the same thing.
A technical term for 'double expression' or 'redundant phrase', often discussed in writing guides.
'My headache hurts' is an example of a redundant expression.
A statement that is true by necessity or by its logical form, often used in philosophy or mathematics.
Repeating the same idea in different words to reinforce a point, common in speeches or persuasive writing.
Means 'in other words', often used to restate something for clarity, which can create a tautology if the restatement adds no new information.
He is an honest person. In other words, he doesn't lie.
Means 'that is to say' or 'in short', used to summarize or rephrase, sometimes resulting in tautology.
In Japanese, certain combinations like 「馬から落馬する」(fall off a horse from a horse) or 「後で後悔する」(regret later afterwards) are considered awkward tautologies. Be mindful of compound words that already contain the meaning you're adding.
Patterns like 「AはAだ」 are not considered poor style in casual Japanese; they are a natural way to express inevitability or acceptance. Use them freely in conversation.
This proposition is a tautology.
Literally 'same word repetition', sometimes used for logical tautology but more often for rhetorical repetition.
That argument is nothing but a tautology.
彼は無職だ。つまり、仕事がない。
He is unemployed. That is, he has no job.