This is the 15316th most frequent German word.
unterspült
"Unterspült" means "undermined by water" or "eroded underneath."
In this sentence, 'unterspült' refers to the action of water washing out or undermining the ground beneath, leading to instability.
Der Fluss hat den Boden unterspült und machte ihn unstabil.
The river had eroded the soil, making it unstable.
Here, 'unterspülen' describes the continuous action of waves removing sand from beneath a structure.
Die Wellen unterspülen den Sand unter der Brücke.
The waves are washing away the sand beneath the bridge.
In this context, 'unterspülte' indicates something already undermined or eroded by water, showing its effects.