s, a, o, d, g, n, c, r, t, i are letters that make 'rain cats and dogs'
AN, DO, do, dog, rain, at, ain, in, cat, AI, CAT, ai, RA, CA, IN, ND, Ra, At, Ca, In, Nd are words within 'rain cats and dogs'
1 possible definitions for 'rain cats and dogs'
Under this definition, rain cats and dogs is a verb and has the following properties:
pour, pelt, stream, rain buckets have the same meaning as 'rain cats and dogs'
sheet, sluice, sluice down are types of 'rain cats and dogs'.
downpour, cloudburst, waterspout, torrent, soaker, pelter, deluge are derivatives of 'rain cats and dogs'.