ellos castigarán

they will punish, you all will punish

→ castigar
castig punish + arán 3rd-person plural future (indicative or subjunctive)
verb · third plural · future indicative Rare #48,638
they will punish, you all will punish
SP: Los profesores castigarán a los estudiantes por copiar en el examen.
EN: The teachers will punish the students for copying on the exam.
Conjugation of castigar
Indicative future
SingularPlural
Third castigará castigarán
Subjunctive future
SingularPlural
Third castigará castigarán

Si llegan a saber la verdad sobre mí, los castigarán a todos por darme refugio.

If they find out the truth about me, they’ll punish everyone for giving me shelter.

— RRR (2022)

Me castigarán.

They will punish me.

Te castigarán.

You will be punished.

— Los chicos del coro (2004)

Me castigarán por esto.

They will punish me for this.