Lewis & Short

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dū̆plex, ĭcis (abl. commonly duplici; duplice, Hor. S. 2, 2, 122), adj. [duo-plico], twofold, double.

  1. I. Lit.: et duplices hominum facies et corpora bina, Lucr. 4, 452; cf. aër (with geminus), id. 4, 274: cursus (with duae viae), Cic. Tusc. 1, 30: pars (opp. simplex), Quint. 8, 5, 4; cf. id. 4, 4, 5: modus (opp. par and sesquiplex), Cic. Or. 57, 193 et saep.: duplici de semine, Lucr. 4, 1229: quem locum duplici altissimo muro munierant, Caes. B. G. 2, 29, 3: fossa duodenūm pedum, id. ib. 7, 36 fin.: vallum, id. B. C. 3, 63, 3: rates, id. ib. 1, 25, 6: tabellae, consisting of two leaves, Suet. Aug. 27: dorsum, consisting of two boards, Verg. G. 1, 172: acies, Caes. B. G. 3, 24, 1; id. B. C. 1, 83, 1; 3, 67, 3 al.; cf. proelium, Suet. Aug. 13: seditio, id. Tib. 25: triumphus, id. Dom. 6: cura, id. Tib. 8 et saep.
    Prov.: duplex fit bonitas, simul accessit celeritas, who gives promptly gives twice, Pub. Syr. 141 (Rib.).
    1. B. Transf.
      1. 1. Of things made double by being divided into two, cloven, bipartite, double: ne duplices habeatis linguas, ne ego bilingues vos necem, Plaut. Truc. 4, 3, 7; cf. id. As. 3, 3, 105: ficus, Hor. S. 2, 2, 122; Plin. 20, 6, 23, § 52; Veg. Vet. 2, 10, 6 (1, 38, p. 265 Bip; cf. id. 1, 56, p. 281 Bip.): folia palmae, Plin. 16, 24, 38, § 90: lex, Quint. 7, 7, 10.
      2. 2. Poet., like the Gr. διπλοῦς, of things in pairs, for ambo or uterque, both: oculi, Lucr. 6, 1145: palmae, Verg. A. 1, 93; cf. Ov. Am. 3, 327.
      3. 3. Opp. to single, like the Gr. διπλοῦς and our double, for thick, strong, stout: clavi, Cato R. R. 20: amiculum, Nep. Dat. 3; cf. pannus, Hor. Ep. 1, 17, 25: fenus, Prop. 3 (4), 1, 22 (for which: magnum fenus, Tib. 2, 6, 22).
      4. 4. With quam in post-Aug. prose, for alterum tantum, twice as much as, Col. 1, 8, 8: duplex quam ceteris pretium, Plin. 19, 1, 2, § 9; Quint. 2, 3, 3.
  2. II. Trop.
      1. 1. Of words, of a double sense, ambiguous: verba dubia et quasi duplicia, Quint. 9, 2, 69.
      2. 2. In poets, like the Gr. διπλοῦς, of character, qs. double-tongued, double-faced, i. e. false, deceitful: Ulixes, Hor. C. 1, 6, 7: Amathusia, Cat. 68, 51; so, animo, Vulg. Jacob. 1, 8; 4, 8.
        Adv.: dū̆-plĭcĭter, doubly, on two accounts, Lucr. 6, 510; Cic. Ac. 2, 32, 104; id. Fam. 9, 20: res conscriptae, ambiguously, Arn. 5, p. 182; Vulg. Sirach, 23, 13.

dū̆plĭco, āvi, ātum, 1 (u long, Verg. E. 2, 67), v. a. [duplex], to double (class.)

  1. I. Lit.: numerum dierum, Cic. N. D. 1, 22; so, numerum, id. Rep. 2, 20 (twice); Caes. B. G. 4, 36, 2; Tac. H. 2, 30: modum hastae, Nep. Iphicr. 1 fin.: exercitum, Cic. Att. 5, 18, 2; cf. copias, Liv. 7, 7: fructum, Varr. R. R. 1, 69, 1; cf.: reditum pretio, Col. 12, 52, 2: rem, Pers. 6, 78: stipendium legionibus in perpetuum, Suet. Caes. 26: tributa, id. Vesp. 16: verba, i. e. to repeat, Cic. Or. 39, 135 (with iterare); id. Part. 6, 20 sq.; also, to form a bipartite word, to compound (e. g. androgynus): faciliore ad duplicanda verba Graeco sermone, Liv. 27, 11.
  2. II. Transf.
    1. A. (Acc. to duplex, I. B. 3.), to double, i. e. to enlarge, augment, increase: mobilitas duplicatur, Lucr. 6, 337: duplicato ejus diei itinere, Caes. B. C. 3, 76 fin.; cf. cursu, id. ib. 3, 92, 2: et sol crescentes decedens duplicat umbras, Verg. E. 2, 67; cf. Ov. M. 11, 550: duplicata nimbo flumina, id. Am. 1, 9, 11: ut in dies magis magisque haec nascens de me duplicetur opinio, Cic. Fil. Fam. 16, 21, 2: curam, Sall. Or. Cottae, p. 245 ed. Gerl.; cf. sollicitudines, Lucei. in Cic. Fam. 5, 14, 2: bellum, Sall. Fragm. ap. Serv. Verg. E. 2, 67.
    2. B. In poets and in post-Aug. prose meton. (effectu pro causa), to double up, to bow, bend a person or thing: nos duplicat timos, Naev. ap. Non. p. 487 (Trag. v. 45 Rib.): duplicato poplite, Verg. A. 12, 927: corpus frigore, Val. Max. 5, 1, 1 ext.: virum dolore, Verg. A. 11, 645; Ov. M. 6, 293; Stat. Th. 3, 89; 6, 859.
    3. C. To double by dividing, to split in two, tear apart, tear (late Lat.): capillum, Cels. 7, 7, 8: vesicam, id. 7, 26, 2 fin. al.
      Hence, * dū̆plĭcāto, adv., twice as much: degredi, Plin. 2, 17, 14, § 76.