Meaning of “combat” - Learner’s Dictionary

combat

verb [ T ] uk us /ˈkɒmbæt/ (present participle combatting, past tense and past participle combatted, present participle combating, past tense and past participle combated)

to try to stop something unpleasant or harmful from happening or increasing:

New measures have been introduced to combat the rise in crime.

(Definition of “combat verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)