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break into song
utaidasu
meaning: break into song
急きゅうに歌うたい出だすからびっくりしたよ。
kyuu ni utaidasu kara bikkuri shita yo.
You suddenly broke into song, so I was surprised. casual
観客かんきゃくは音楽おんがくに合あわせて一斉いっせいに歌うたい出だしました。
kankyaku wa ongaku ni awasete issei ni utaidashimashita.
The audience broke into song together, in time with the music. neutral
utaidasubreak into song; start singingG1