from side to side
Las ballenas mueven la cola de arriba a abajo, los tiburones de lado a lado.
Whales move their tails up and down, sharks from side to side.
El barco se balanceaba de lado a lado durante la tormenta.
The ship was rocking from side to side during the storm.
Estas huellas van de lado a lado.
These footprints go from side to side.
From side to side.