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

• thallophytic
• thallus
• thalmencephalon
• thalweg
• Thames
• Thames River
• Thammuz
• Thamnophilus
• Thamnophis
• Thamnophis proximus
• Thamnophis sauritus
• Thamnophis sirtalis
• than
• thana
• thanatology
• thanatophobia
• thanatopsis
• Thanatos
• Sparidae
• sparing
• sparingly
• spark
• spark advance
• spark arrester
• spark chamber