I. ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ noun
Etymology: under (III) + dress, n.
: clothing worn under outer clothing ; especially : a decorative petticoat showing where the overskirt is draped back
II. | ̷ ̷ ̷ ̷| ̷ ̷ intransitive verb
Etymology: under (I) + dress, v.
: to dress more simply or less formally than is customary
after three winters of wartime underdressing — Time