Lewis & Short

abs-trūdo, ūsi, ūsum, 3, v. a., to push or thrust away, and hence to conceal (cf. abdo).

  1. I. Lit.: aurum, Plaut. Aul. 4, 6, 13; so ib. 4, 5, 3: id. Curc. 5, 2, 8: in cerebro colaphos, to thrust into the brain itself, id. Rud. 4, 3, 68 (cf. a similar passage from Verg. under abdo): mane me in silvam abstrusi densam, Cic. Att. 12, 15: tectum inter et laquearia, Tac. A. 4, 69.
  2. II. Trop.: in profundo veritatem, Cic. Ac. 2, 10: tristitiam, Tac. A. 3, 6: metum, id. ib. 15, 5 al.
    Hence, abstrūsus, a, um, P. a., hidden, concealed.
    1. A. Lit.: corpus abstrusum in flumine, Att. ap. Non. 308, 8 (Trag. Rel. p. 195 Rib.): insidias, Cic. Leg. Agr. 2, 49: terra, Ov. H. 7, 147: incendium, Vell. 2, 130, 4.
      With dat.: serpens abstrusa terrae, Vell. 2, 129, 4.
      1. 2. In neutr. absol.: in abstruso esse, to be in concealment, Plaut. Poen. 1, 2, 129; to be unknown, Amm. 17, 7.
    2. B. Trop.: dolor reconditus et penitus abstrusus, a concealed and inwardly repressed sorrow, Auct. Or pro Dom. 10: disputatio paulo abstrusior, requiring a somewhat deeper investigation, Cic. Ac. 2, 10, 30: homo abstrusus, reserved, Tac. A. 1, 24.
      Sup. not used.
      Adv. comp.: abstrūsĭus, Amm. 28, 1, 49: semet amandarunt, more closely.