1. In contact with
   "leaning against the door" 
2. Playing in opposition to
   "Manchester against Liverpool should be a good match"
   - versus 
3. Opposed to
   "I'm against commercialization of space" 
4. In contrast to
   "look dark against the window"

Encyclopedia: Against

• stanch
• stanchion
• stanchly
• stand
• stand back
• stand fast
• stand firm
• stand for
• stand guard
• stand oil
• stand out
• stand sentinel
• stand watch
• stand-alone
• stand-in
• stand-off half
• stand-up
• standard
• Standard and Poor's
• Standard and Poor's Index
• standard atmosphere
• standard candle
• standard cell
• standard deviation
• Standard English