Merso, mersas, mersare, Frequentatiuum. Columell. Virgil. To drowne often: to dippe in often.Aries mersatur in gurgite.Virg.Fluctibus fortunæ mersor. Catull.
Lewis and Short: Latin dictionary
merso, āvi, ātum, 1, v. freq. a. [id.], to dip in, immerse (poet. and in post-Aug. prose). I.Lit.: balantumque gregem fluvio mersare salubri, Verg. G. 1, 272: balneo infertur, calida aqua mersatur, Tac. A. 15, 69.—II.Trop., to overwhelm: rerum copia mersat,
drowns, destroys
, Lucr. 5, 1008: mersor civilibus undis,
plunge myself
, Hor. Ep. 1, 1, 16.—III.Pass.: mersari, to set, of the stars, Mart. Cap. 8, 844; cf. merto.