Japanese say GOCHISOSAMA at the end of every meal.
„Chiso“ of Gochisosama means run.
In the past, it was not so easy for the host to prepare good meal for the guest.
The host or the cook of the host needs to run a lot in order to get the nice ingredients for the good meal.
So, GOCHISOSAMA is to thank the host for running to get nice ingredients to make good meal.