v. rare. [UNDER-1 4 a, b, 8 a.] To search or seek under or into; to investigate.
1609. Daniel, Civ. Wars, III. iv. Whilst th vnder-searching water, working-on, Beares (proudly) downe, all that was idly don.
1648. Hexham, II. Ondertasten, to Examine, or Vndersearch.