llenar
/ʝeˈnaɾ/ · A2 · verb
to fill something up
🪣 llenar = lleno (full) + -ar: to make full, from Latin plenus
Latin pl- became Spanish ll-: plenus gave lleno, just as pluvia gave lluvia. English kept the pl- in plenty and replenish. So llenar is to make plenty: fill a glass, fill out a form, fill the last seat in a group.