1.
the other day, a few days ago, recently
A day in the recent past, typically within the last week or two.
先日はありがとうございました。
Thank you for the other day.
Common polite expression
先日電話で話した件ですが...
Regarding the matter we discussed on the phone the other day...
先日偶然駅で会いました。
I ran into you by chance at the station the other day.
先日お送りした書類は届きましたでしょうか。
Did you receive the documents I sent the other day?
先日の会議で決まったことを、今日の午後にもう一度確認しましょう。
Let's reconfirm this afternoon what was decided at the meeting the other day.
先日 is a polite way to refer to a recent day.
COMMON EXPRESSIONS:
- 先日はありがとうございました (Thank you for the other day)
- 先日は失礼しました (Sorry about the other day)
- 先日お話しした... (As I mentioned the other day...)
COMPARISON:
- 先日: the other day (polite/formal)
- この間/この前: the other day (casual)
- 数日前: a few days ago (neutral)