estaban agrietando
-they/you were cracking
Imperfecto progresivo para el sujeto ellos/ellas/ustedes del verbo agrietar.

agrietar

Ellos se estaban agrietando alrededor del diamante que figuraba en ellos.
They were cracking around the diamond that was featured on them.
Con la temperatura repentino caloroso, las cataratas de hielo se estaban agrietando y derretiendo.!
With the sudden warmth in temperature, the frozen waterfalls were cracking and melting!
Palabra del día
la leña