prep.1.  In a direction or course opposite to: row against the current.
2.  So as to come into forcible contact with: waves dashing against the shore.
3.  In contact with so as to rest or press on: leaned against the tree.
4.  In hostile opposition or resistance to: struggle against fate.
5.  Contrary to; opposed to: against my better judgment.
6.  In competition with: raced against the record holder.
7.  In contrast or comparison with the setting or background of: dark colors against a fair skin.
8.  In preparation for; in anticipation of: food stored against winter.
9.  As a defense or safeguard from: protection against the cold.
10.  To the account or debt of: drew a check against my bank balance.
11.  Directly opposite to; facing.