Also means
substitute
Usage Note
Sub is a colloquial shortening used in Spanish sports commentary for suplente (substitute player) and in online gaming culture for suscriptor (subscriber). As a prefix (sub-) it is unstressed and attached directly (subsuelo, subgrupo); as a standalone noun it is informal. The plural is subs.
Examples
"El entrenador mandó un sub al campo en el descanso."
Natural Translation
The coach sent a substitute onto the field at halftime.

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