Definition of "against" []

• In a direction or course opposite to: row against the current. (preposition)
• So as to come into forcible contact with: waves dashing against the shore. (preposition)
• In contact with so as to rest or press on: leaned against the tree. (preposition)
• In hostile opposition or resistance to: struggle against fate. (preposition)
• Contrary to; opposed to: against my better judgment. (preposition)

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.

• "Simultaneously 'With us' and 'against us' yahooBuzzArticleHeadline = 'Simultaneously \'With us\' and \'against us\ ''; yahooBuzzArticleSummary = 'Article: The US is helping the Sunnis, both inside and outside of Iraq to target al Qaeda in Iraq, but these are also anti-government forces opposed to the very government that America created."
• "The United States shall guarantee to every State in this Union a republican form of government; and shall protect each of them against invasion; and, on application of the legislature, or of the executive, (when the legislature cannot be convened) _against domestic violence_."
• "-- The United States shall guarantee to every State in this Union a republican form of government; and shall protect each of them against invasion; and, on application of the legislature, or of the executive, (when the legislature cannot be convened) _against domestic violence_."