What does たちまち mean?
たちまち is a Japanese noun meaning “instantly, suddenly, all at once” in English. It can also be translated as “suddenly” depending on context. It is written as たちまち in hiragana, and tachimachi in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
切符はたちまち売り切れた。
The tickets were sold out in a moment.