A business trip—traveling away from one's usual workplace for work-related duties, domestically or abroad.
来月は東京へ出張します。
I'll be on a business trip to Tokyo next month.
出張中はメールの返信が遅れるかもしれません。
While on a business trip, my email replies may be delayed.
出張費は領収書を添付して申請してください。
Please submit travel expenses with receipts for reimbursement.