plop
US /plɑːp/
UK /plɑːp/

1.
plouf, flop
a sound of something falling or dropping heavily into liquid or onto a soft surface
:
•
The stone fell into the pond with a soft plop.
La pierre est tombée dans l'étang avec un doux plouf.
•
There was a sudden plop as the fruit dropped from the tree.
Il y eut un plouf soudain lorsque le fruit tomba de l'arbre.