To border; to be adjacent to.
And when they opposed themselves, and blasphemed, he shook his raiment, and said unto them, Your blood be upon your own heads; I am clean: from henceforth I will go unto the Gentiles. And he departed thence, and entered into a certain man's house, named Justus, one that worshipped God, whose house JOINED HARD to the synagogue. ( Acts 18:6-7 )
Bibliography Information"Entry for 'Joined hard'". A King James Dictionary.