To run or pass under; especially (Naut.), to pass along and under, as a cable, for the purpose of taking it in, or of examining it.
- To run, pass, or go beneath.
- Nautical To haul (a line or cable) onto a boat for inspection or repair.
- Something that runs under, as:
- An amount or a quantity produced that is less than what has been estimated.
- The difference between this amount or quantity and what has been estimated.
- An undercurrent.