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

• Tourette's syndrome
• touring car
• tourism
• tourist
• tourist attraction
• tourist class
• tourist court
• touristed
• touristic
• touristry
• touristy
• tourmaline
• tournament
• tournedos
• tourney
• tourniquet
• Tours
• tourtiere
• tousle
• tousled
• tout
• tout de suite
• tout ensemble
• touter
• tovarich