Gopalasutta 5.2

5.2

Idha, bhikkhave, bhikkhu uppannaṃ kāmavitakkaṃ adhivāseti nappajahati na vinodeti na byantīkaroti na anabhāvaṃ gameti, uppannaṃ byāpādavitakkaṃ … uppannaṃ vihiṃsāvitakkaṃ …

It’s when a mendicant tolerates a sensual, malicious, or cruel thought that has arisen. They don’t give it up, dispel it, eliminate it, and obliterate it.