Tashlich (תשליך) is a ritual that many Jews observe during the High Holidays.
"Tashlich" means "casting off" in Hebrew and involves symbolically
casting off the sins of the previous year by tossing pieces of bread or
another food into a body of flowing water. Just as the water carries
away the bits of bread, so too are sins symbolically carried away. In
this way the participant hopes to start the New Year with a clean slate.