1. Noun

   fallen scraps; scatterings

2. leftovers; remainder; pickings; odds and ends

3. Noun, Noun which may take the genitive case particle 'no'

   student who cannot keep up in school; dropout (from school, society, a movement, etc.)

   ColloquialSensitivesee 浮きこぼれ

Also written 落ち零れ【おちこぼれ】ochikobore