[f. BULLY sb. + -ISM.] The conduct or practice of a bully.

1

a. 1849.  Poe, Longf., &c. Wks. 1864, III. 320. The Outises who practice this species of bullyism are as a matter of course anonymous.

2

1886.  All Y. Round, 27 Feb., 35. The spirit of ‘bullyism’ … peculiarly prevalent in the Northern States.

3