noun pl. un·der·sup·plies A supply smaller than what is appropriate or required.
transitive verb (ŭnˌdər-sə-plīˈ) un·der·sup·plied,
un·der·sup·ply·ing,
un·der·sup·plies To supply in an amount insufficient to what is appropriate or required: undersupplied the troops with blankets; undersupplied blankets to the troops.