あっと

あっと, アッと, アっとatto

adverb

  1. with a (cry of) "ah!"
  2. with a shout (of surprise, shock, etc.)
  3. in surprise
  4. in astonishment

Study it in Yanamino

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