あーん

あーん, ああん, アーンaan

adverb · noun · suru verb

  1. opening (one's mouth) wide
  2. saying "aah"
  3. crying loudly
  4. wailing
  5. bawling

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences