noun
sending word; writing to someone
Refers to the act of conveying a message or writing to someone, often via letter or messenger. Slightly formal or old-fashioned; in modern casual contexts, 連絡 or 手紙を書く are more common.
先日はお申し越しいただき、ありがとうございます。
Thank you for your message the other day.
ご用件がございましたら、どうぞお申し越しください。
If you have any business, please send word.
Compound of 申し (continuative form of 申す, humble 'to say') + 越し (continuative form of 越す, 'to go over, cross'). Literally 'saying across', referring to sending a message over a distance.