verb/aɡɾuˈpaɾ/
to group together; to band together; to cluster (form a cluster)
“y eso es lo que hice entonces, tomar pie del interés con que la joven continuaba escogiendo y agrupando en montoncitos lo atropado en el arenal” — So that is what I did next, take the opportunity of the interest with which the young woman kept choosing and piling together what she had caught in the sand.
Synonyms: apiñar, acoplar, aglutinar, amontonar, aglomerar
From a- + grupo + -ar.