1. Having the wind against the forward side of the sails
   "the ship came up into the wind with all yards aback"
    
2. By surprise
   "taken aback by the caustic remarks"

Encyclopedia: Aback

• Allegheny
• Allegheny chinkapin
• Allegheny mountain spurge
• Allegheny Mountains
• Allegheny plum
• Allegheny River
• Allegheny spurge
• Allegheny vine
• allegiance
• allegiant
• allegoric
• allegorical
• allegorically
• allegorise
• allegoriser
• allegorist
• allegorize
• allegorizer
• allegory
• allegretto
• allegro
• allegro con spirito
• allele
• allelic
• allelomorph