underdraft

[uhn-der-draft, -drahft]
noun Metalworking.
  1. a tendency of a rolled piece to curve downward after passing through a stand, occurring when the upper roll is faster than the lower.Compare overdraft(def 7).

Origin of underdraft

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018