お兄さん

• (Tokyo) おにいさん [òníꜜìsàǹ] (Nakadaka – [2])
• IPA^(key): [o̞ɲ̟iːsã̠ɴ]

お兄(にい)さん • (onī-san) 

1. (honorific) elder brother

   あなたはお兄(にい)さんがいますか。

   Anata wa onī-san ga imasu ka.

   Do you have any elder brothers?

2. you, he, him (a non-aged male stranger)

   お兄(にい)さんはどこからきましたか。

   Onī-san wa doko kara kimashita ka.

   Where are you from?

• お兄さん is a polite word, mostly used in a talking about someone else's elder brother. Japanese people tend to use 兄 (ani) when referring to their own elder brother. Japanese children tend to use お兄ちゃん (onī-chan) or 兄ちゃん (nī-chan) when referring to their own elder brother.