bang off

bang off (third-person singular simple present bangs off, present participle banging off, simple past and past participle banged off)

1. (transitive, informal) To fire (a weapon or a shot).
2. (transitive, informal) To typewrite quickly.

   I banged off a letter of complaint to the local newspaper.

3. (weaving, intransitive) Of an automated loom: to have the shuttle fail to follow its intended path and bang against other parts of the loom.
   • 1914, “Cyclopedia of Textile Work”, in American School, Lansing, Ill., page 217:

     The loom may run well for half an hour, or longer, but as soon as the point of the cam comes in contact with the flat place on the cone a soft pick is the result, and the shuttle not being driven far enough into the box the loom bangs off on the next pick.

   • 1915, America's Textile Reporter, page 832:

     If you use our waterproof bobbins you don't have any looms banging off because of filling yarn breaking on splintered, cracked and split bobbins.