How to Say "onset" in Spanish
The Spanish word for “onset” is “asalto” — B2 level.
English → SpanishB2
nounB2neutral/formal
the beginning of something unpleasant, like a disease
Examples
El asalto a la fortaleza fue un éxito, pero costó muchas vidas.
The assault on the fortress was a success, but it cost many lives.
Sufrió un asalto de tos en medio de la reunión.
He suffered an onset of coughing during the meeting.
Military Context
In military history or strategy, 'asalto' refers to a concentrated, often final, offensive push.
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