upbow

noun

1. A note performed on a string instrument by drawing the bow upward or to the left across the instrument, moving the point of contact from the bow's tip toward the frog.

verb

1. To bend or arc upwards.

   “In terms of the mechanics postulated above, this late deformation cycle started with upbowing of the anticlinal axis to produce the cross joints. Continued upbowing instigated persistent movement along these fractures.”