See: THROW TOGETHER(1).
To make in a hurry and without care. * /Bill and Bob threw together a cabin out of old lumber./ * /The party was planned suddenly, and Mary threw together a meal out of leftovers./ 2. To put in with other people by chance. * /The group of strangers was thrown together when the storm trapped them on the highway./ * /Bill and Tom became friends when they were thrown together in the same cabin at camp./