What does 顎 mean?
顎 is a Japanese noun meaning “chin” in English. It can also be translated as “barb (of a fishhook)” depending on context. It is written as 顎 in kanji, あご in hiragana, and ago in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
私は彼のあごに１発食らわしてやった。
I landed him a blow on the chin.