prikupljati

1. to collect; to gather
   Studenti prikupljaju potpise za peticiju. — The students are collecting signatures for a petition.
   Udruženje prikuplja novac za lečenje dečaka. — The association is raising money for the boy's treatment.
2. (strength, courage) to gather; to muster
   Dugo je prikupljala hrabrost da mu kaže istinu. — She spent a long time mustering the courage to tell him the truth.

The perfective is prikupiti.