mackerel

noun6

1. •
   Certain smaller edible fish, principally true mackerel and Spanish mackerel in family Scombridae, often speckled,
2. •
   Typically Scomber scombrus in the British isles.

   • […] you may buy land now as cheap as stinking mackerel. — 1597
3. •
   A true mackerel, any fish of tribe Scombrini (Scomber spp., Rastrelliger spp.)
4. •
   Certain other similar small fish in families Carangidae, Gempylidae, and Hexagrammidae.
5. •
   [before a noun] A regular pattern, similar to fish scales, of undulating small clouds with sky visible between them.

   • MACKEREL CLOUDS.- Mackerel scales and mares' tails / Make lofty ships carry low sails. — 1892
6. •
   (no longer used) A pimp; also, a bawd.

   • […] nyghe his hows dwellyd a maquerel or bawde […] — 1483