tostaron
-they toasted
The word tostaron is the preterite form of tostar in the third person plural.
See the full tostar conjugation

tostar

Los hombros se te tostaron al sol y ahora se te están pelando.
Your shoulders got a sunburn and now they're peeling
Con el calor solo, se tostaron bien.
The heat alone browned them nicely.
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