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LingakuLingakuそう言えば + [sentence]
Standalone expression used at the beginning of a sentence as a discourse marker. Often written in hiragana: そういえば
そう言えば (often written in hiragana as そういえば) is a conversational expression used to introduce a topic that the speaker has just recalled or been reminded of. It translates naturally to "come to think of it", "now that you mention it", or "speaking of which" in English.
It typically appears at the beginning of a sentence and signals that something in the current conversation has triggered a related thought or memory. The speaker is saying, "Now that you say that, I just remembered..."
そう言えば is used when something in the conversation naturally reminds the speaker of a related topic. It is not used to abruptly change the subject without any connection to what was said.
It can be used in both casual and polite contexts. The expression itself does not change formality – the rest of the sentence determines the register.
The literal meaning is "if you say so" or "speaking of saying that," which reflects the idea that what someone just said has prompted a new thought.
It is sometimes written entirely in hiragana (そういえば) in casual writing and texting.