What it means
そう言えば introduces a thought that comes to mind because of something just mentioned or because the speaker has made an association. It is used to shift briefly to a related topic, often translated as “now that you mention it” or “speaking of which.” The following statement may provide new information, a reminder, or a question connected to the preceding context.
Usage note
そう言えば is a discourse expression rather than a clause-ending form, so it commonly appears at the beginning of a sentence and is often followed by a pause in speech or a comma in writing. It can be used in both casual and polite conversations without changing its form.
Example sentences
そう言えば、駅前の書店は来週から営業時間を変更するそうです。
Now that you mention it, I hear the bookstore in front of the station will change its business hours starting next week.