たちまち

たちまちtachimachi

adverb

  1. in an instant
  2. in a moment
  3. immediately
  4. right away
  5. at once
  6. suddenly
  7. all of a sudden
  8. all at once

Study it in Yanamino

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