BT Šab 140b(16) :אנא מיעיקרא לא הוה בצ{ינ}עא עד דשדאי ידא בכל מנא ואשכחי ^ביה כל צורכי^‏ : initially, I would not break (bread) until I had felt (all the loaves) in my container, and I found in it all that I needed
See the entire entry for šdy vb. to throw (away or down)