banging off

Verb

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

1. (informal, transitive) To fire (a weapon or a shot); to ejaculate.
2. (informal, transitive) To typewrite quickly.
   • I banged off a letter of complaint to the local newspaper.
3. (intransitive) Of an automated loom: to have the shuttle fail to follow its intended path and bang against other parts of the loom.
   • 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.1914, “Cyclopedia of Textile Work”, in American School, Lansing, Ill., page 217