'Sided' in the Bible

Absalom also sent for Ahithophel the Gilonite, David's counselor, to come from his home town of Giloh while Absalom was presenting the sacrificial offerings. And so the conspiracy widened, because the common people increasingly sided with Absalom.

Now David had been told, "Ahithophel has sided with the conspirators who are with Absalom. So David prayed, "Make the advice of Ahithophel foolish, O Lord!"