Definition of "underrun" []

• To run, pass, or go beneath. (verb-transitive)
• Nautical To haul (a line or cable) onto a boat for inspection or repair. (verb-transitive)
• Something that runs under, as: (noun)
• An amount or a quantity produced that is less than what has been estimated. (noun)
• The difference between this amount or quantity and what has been estimated. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The item estimate vs actual is 5% over budget (cost overrun) the project cost is under budget (project cost underrun)."
• "Again the witnesses confirmed he watched the approaching trailer, and did nothing until the underrun bar was touching his windscreen wipers."
• "Specifically he said the situation is, "a shocking development, both because of the magnitude of the underrun (about 20 percent) and the late date of its discovery.""