what is a COLB
Full Definition of COB. 1. [perhaps short for cobswan lead swan] : a male swan. 2. a dial English: a rounded mass, lump, or heap b: a mixture of unburnt clay and straw used especially for constructing walls of small houses in England. 3. : a crudely struck old Spanish coin of irregular shape. 4. : corncob 1. 5.