What does 空～ mean?
空～ is a Japanese noun meaning “empty ~” in English. It is written as 空～ in kanji, くう～ in hiragana, and kuu～ in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
今晩、６時までなら空いてます。
I am free till 6 o'clock this evening.