This is the 3402nd most frequent French word.
ber
"Ber" in French means "cradle" or "dock cradle" depending on context.
In this sentence, 'ber' is used to describe a keel block or cradle for supporting ships in a port.
Le bateau repose sur un ber au port.
The boat rests on a cradle at the dock.
Here, 'berce' is a conjugated form of the verb derived from 'ber', indicating the action of rocking in a soothing manner.
La mer berce doucement le bateau.
The sea gently rocks the boat.
In this context, 'bercé' comes from the same root as 'ber', symbolizing being comforted or soothed.