How to Say "in unison" in Spanish
The Spanish word for “in unison” is “coro” — B1 level.
English → SpanishB1
nounB1
simultaneous speaking or acting

Examples
Todos los estudiantes gritaron '¡Sorpresa!' a coro.
All the students shouted 'Surprise!' in unison.
Cuando le hicieron la pregunta, el público asintió a coro.
When they asked him the question, the audience nodded simultaneously.
Fixed Phrase
This meaning almost always appears with the little word 'a' (like 'to' or 'at') to create the adverbial phrase 'a coro,' meaning 'all at once' or 'together.'
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