Dictionary.com
definitions

ground bait

noun
  1. chum2(def 1).

Origin of ground bait

First recorded in 1645–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for groundbait

groundbait

noun
  1. bait, such as scraps of bread, maggots, etc, thrown into an area of water to attract fishSee chum 2
verb
  1. (tr) to prepare (an area of water) with groundbait
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012