Lewis & Short

2. cālīgo, āre, v. n. [1. caligo].

  1. I. To emit vapor or steam, to steam, reek: amnes aestate vaporatis, hieme frigidis nebulis caligent, Col. 1, 5, 4: aram tenui caligans vestiet umbrā, Cic. Arat. 205 (449); cf.: omnem quae nunc Mortalis hebetat visus tibi et umida circum Caligat, nubem eripiam, Verg. A. 2, 606.
    1. B. Transf.
      1. 1. To be involved in darkness, to be dark, gloomy: caligare oculos, darkness covers the eyes, Lucr. 3, 157; Verg. G. 4, 468; Stat. Th. 1, 95.
      2. 2. Poet.: altae caligantesque fenestrae, dizzy, Juv. 6, 31.
  2. II. Trop., of the understanding, to be blind, to be surrounded by darkness, to grope about: orbatae caligant vela carinae, Stat. S. 5, 3, 238: caligare ad pervidendum, Sen. Vit. Beat. 1, 1: virtus inhorrescit ad subita, et caligabit, si, etc., id. Ep. 57, 4; Plin. 30, 1, 1, § 2; Quint. Decl. 18 fin.: rex caligare alto in solio, nec pondera regni posse pati, Sil. 14, 88.
    Prov.: caligare in sole, to grope in broad daylight, Quint. 1, 2, 19.
    1. B. In medic. lang., of the eyes, to suffer from weakness, be weak, Cels. 6, 6, 32; Plin. 20, 22, 87, § 239; cf. id. 11, 37, 54, § 147.
      Transf., of the person, to be dim-sighted: caligans Thyestes, Mart. 10, 4, 1; Scrib. Comp. 184.