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

• councilwoman
• counsel
• Counsel to the Crown
• counseling
• counselling
• counsellor
• counsellorship
• counselor
• counselor-at-law
• counselorship
• count
• Count Alessandro di Cagliostro
• Count Alessandro Volta
• Count Ferdinand von Zeppelin
• Count Fleet
• Count Lev Nikolayevitch Tolstoy
• Count Maurice Maeterlinck
• Count Nikolaus Ludwig von Zinzendorf
• count noun
• count off
• count on
• count out
• count palatine
• count per minute
• Count Rumford