fall off
US /fɔːl ɔːf/
UK /fɔːl ɔːf/

1.
disminuir, bajar
to decrease in quantity or quality; to decline
:
•
Sales tend to fall off during the winter months.
Las ventas tienden a disminuir durante los meses de invierno.
•
His performance has started to fall off recently.
Su rendimiento ha empezado a disminuir recientemente.