underrun

un·der·run  (ndr-rn)

tr.v. un·der·ran (-rn), un·der·run, un·der·run·ning, un·der·runs

1. To run, pass, or go beneath.

2. Nautical To haul (a line or cable) onto a boat for inspection or repair.

n.

1. Something that runs under, as:

a. An amount or a quantity produced that is less than what has been estimated.

b. The difference between this amount or quantity and what has been estimated.

2. An undercurrent.