an outburst of activity
a bit/morsel of advice
a blast/breath/current/gust of air
a fit/an outburst of anger
a bundle/ wad of banknotes
a chunk/crumb/crust/hunk/loaf/ piece/slice of bread
a knob/lump/pat/slab of butter
a bit/crumb/piece/slice/sliver/wedge of cake