Fromwar +‎-bot.

warbot (pluralwarbots)

1. Arobot used inphysicalwarfare.
2. (Internet) Amaliciousbot(automated user) designed todisrupt other users' activity.
   • 1995, William J. Shefski,Interactive Internet: The Insider's Guide to MUDs, MOOs and IRC:

     Awarbot is designed for use against other users or against IRC itself. Bots meant to do harm are one reason why many servers have banned their presence.

• Bartow,tow bar,towbar

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