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I UK [ˈkɒmbæt] / US [ˈkɑmˌbæt] noun
Word forms "combat":
singular combat plural combats
1) [uncountable] fighting during a war

fears of escalating combat

in combat:

servicemen killed in combat

a) [countable/uncountable] a fight, especially an organized fight, between two people

unarmed combat (= without weapons)

b) [only before noun] relating to fighting in a war

combat forces/troops/aircraft

a combat mission/zone

c) [only before noun] used about clothes worn in the armed forces, especially in a battle

combat fatigues/jackets

2) [singular] an attempt to stop something bad or to solve a difficult problem

These enzymes are important in the combat against bacteria.

II UK [ˈkɒmbæt] / US [ˈkɑmˌbæt] verb [transitive]
Word forms "combat":
present tense I/you/we/they combat he/she/it combats present participle combating past tense combated past participle combated
to do something in order to try to stop something bad from happening or a bad situation from becoming worse

the need for effective action to combat global warming

measures to combat crime

Nouns frequently used as objects of combat
▪  crime, discrimination, disease, fraud, inflation, poverty, racism, terrorism, unemployment, violence

English dictionary. 2014.