How to Say "trial run" in Spanish
The Spanish word for “trial run” is “ensayo” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
a test before the real thing

Examples
Tuvimos el último ensayo de la obra anoche.
We had the final rehearsal for the play last night.
Los científicos están haciendo un ensayo clínico con el nuevo medicamento.
The scientists are running a clinical trial with the new medication.
El equipo de fútbol tiene un ensayo a las cinco para practicar los penaltis.
The soccer team has a practice at five to practice the penalties.
Common Verb Partner
You will most often see 'ensayo' used with the verb 'hacer' (to do/make) when referring to a practice run: 'hacer un ensayo' means 'to run a trial' or 'to hold a rehearsal'.
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