This is the 12349th most frequent Spanish word.
llenó
"Filled" (past tense of "llenar").
The verb 'llenó' is used in the past tense to describe the action of filling something.
Ella llenó el vaso de agua.
She filled the glass with water.
In this sentence, 'llenó' is conjugated in the third person to reflect an event where the backpack became full.
Mi mochila se llenó de libros al preparar para la clase.
My backpack filled with books when preparing for class.
Here, 'llenó' indicates that the news caused a feeling of joy to arise among the students.