A bitter, often prolonged quarrel or state of enmity, especially such a state of hostilities between two families or clans.
To carry on or perpetuate a bitter quarrel or state of enmity.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.