fall to pieces
To disintegrate; collapse.
After the death of Alexander the Great, his empire started to fall to pieces.
fall to
To begin to work.
The boys fell to and quickly cut the grass.
To begin to fight.
They took out their swords and fell to.
To begin to eat.
The hungry boys fell to before everyone sat down.
Begin; start.
The old friends met and fell to talking about their school days.