"speak simultaneously" is correct and usable in written English.
You can use it to describe the act of two or more people speaking at the same time. For example, "The two speakers spoke simultaneously, unable to hear each other due to the loud background noise."
Part of the difficulty was managing Mr. Lonergan's dialogue, in which two or more characters often speak simultaneously.
I think part of the power of the movie is that it can speak simultaneously to insiders and observers".
They are radical, mesmerizingly complex visual propositions whose crystalline forms and introspective faces speak simultaneously of the power of human faith and aesthetic will.
But given that they dress alike and even speak simultaneously, please can someone explain to them in words of one syllable what 'individual means?
Mr. Yamazaki's "Little Lellolello," inspired by a Japanese book featuring illustrations by Kenjiro Okazaki, was forcefully playful, requiring its cast of six to speak simultaneously lines that made little sense without knowing the context; the amateur delivery didn't help.
Mr. Yamazaki's "Little Lellolello,"which was inspired by a Japanese book featuring illustrations by Kenjiro Okazaki, was forcefully playful, requiring its cast of six to speak simultaneously lines that made little sense without knowing the context; the amateur delivery didn't help.
So was I when they started speaking simultaneously and repeating political lines in perfect unison.
The team did not inform reporters that the two would be speaking simultaneously.
But Mr. Gormley, speaking simultaneously in Egg Harbor, refused to admit defeat, saying about 100 precincts had yet to report results.
Mr. McLaren fastened the necklace around Ms. Rabinowitz's neck, and the three of them spoke simultaneously.
One of the digital twists here is that many storyteller-like figures are speaking simultaneously, jockeying for attention and for some form of recognition.
