jan-jan
A loud, energetic clanging noise. Also used figuratively to mean doing something one after another without pause.
💡Ordering rounds at a lively izakaya — 'Drinks were being served jan-jan all night.'
お金をじゃんじゃん使ってしまった。
I spent money jan-jan without thinking.
The construction crew was hammering ___ from early morning.
工事の音が朝から○○響いていた。