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 )

Dictionary of Words from the King James Bible. Public Domain. Copy freely.