noun
front and back; before and after; both ends
Refers to spatial or temporal order: what is in front and behind, or what comes before and after. Often used in set phrases like 後先になる (to be reversed) or 後先を考える (to think ahead and behind).
話の後先が逆になってしまった。
The order of the story got reversed.
彼は後先を考えずに行
He acts without thinking about the consequences.
noun
order; sequence; consequences; context
Used in fixed expressions: 後先になる (to be out of order), 後先考えず (without thinking of the consequences), and 後先を考える (to consider the context or consequences). The core idea is the proper sequence or the implications of actions.
See also: 後先になる
説明の後先が逆で、何を言いたいのかわからない。
The explanation is out of order, so I don't understand what you want to say.
後先考えずに発言して、後悔した。
I spoke without thinking of the consequences and regretted it.
Compound of 後 (あと, 'after, behind') and 先 (さき, 'before, ahead'). The meaning 'order' or 'consequences' developed from the literal spatial/temporal sense.