underrun

noun

1. A condition in which fewer products are delivered or produced than had been ordered.
2. A condition in which the read/write buffer is fed with data at a slower rate than required; a buffer underrun.

verb

1. To run or pass under.

   “He spoke fast, with the uneasy tone that so often underran his words.”

2. To pass along and under, e.g. a cable, for the purpose of taking it in or examining it.
3. To separate the parts of (a tackle) and put them in order.