D defs.my
Entry 2 senses Webster, 1913

Ratting

/(răt"tĭng)/ · Rat·ting · IPA
01 n. The conduct or practices of one who rats. See Rat, v. i., 1.
  1. 1.
    The conduct or practices of one who rats. See Rat, v. i., 1. See: Rat
  2. 2.
    The low sport of setting a dog upon rats confined in a pit to see how many he will kill in a given time.