This is the 12961st most frequent Spanish word.
perderían
"They would lose."
Future hypothetical outcome based on a lack of effort.
Ellos perderían el juego si no se esfuerzan más.
They would lose the game if they don't try harder.
Potential outcome as a result of not being careful.
Si no tuvieran cuidado, perderían sus pertenencias en el viaje.
If they weren't careful, they would lose their belongings during the trip.
Hypothetical situation where missing the train is a consequence.