What does 高～ mean?
高～ is a Japanese noun meaning “high (level) ~” in English. It is written as 高～ in kanji, こう～ in hiragana, and kou～ in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
安いのに栄養価は高いです。
It's inexpensive but very nutritious.