at the mercy of
Ahora estaremos a merced de la corriente.
Now we will be at the mercy of the current.
— El día del fin del mundo: Migración (2026)
El barco estaba a merced de la tormenta.
The ship was at the mercy of the storm.
La chica estaba a merced de su crueldad.
The girl was at the mercy of his cruelty.
El barco está a merced de las olas.
The ship is at the mercy of the waves.