A polite way to refer to the person living next door; commonly used in everyday conversation.
お隣さんが引っ越してきたので、手土産を持って挨拶に行った。
A new neighbor moved in next door, so I brought a small gift and went to greet them.
お隣さんはいつもゴミ出しを手伝ってくれる。
My neighbor always helps with taking out the trash.
夜中に音がうるさかったので、お隣さんに一度注意した。
Because it was noisy late at night, I warned the neighbor once.