It's a fishing net that hangs vertically in the water.
from lustig meaning happy, funny, e.g:Der Maulwurf und seine lustigen Musikanten by Zdenek Miler
Sen
ILE.
ILES
seine
seine
printemps
seine
The Seine?
I netted eight fish with that throw of the seine!
The Seine RiverThe River Seine.
A good pun with the word jump is "Those who jump off a Paris bridge are in Seine"