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