Etymology
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Words related to combat

com- 
Origin and meaning of com-

word-forming element usually meaning "with, together," from Latin com, archaic form of classical Latin cum "together, together with, in combination," from PIE *kom- "beside, near, by, with" (compare Old English ge-, German ge-). The prefix in Latin sometimes was used as an intensive.

Before vowels and aspirates, it is reduced to co-; before -g-, it is assimilated to cog- or con-; before -l-, assimilated to col-; before -r-, assimilated to cor-; before -c-, -d-, -j-, -n-, -q-, -s-, -t-, and -v-, it is assimilated to con-, which was so frequent that it often was used as the normal form.

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batter (v.)
"strike repeatedly, beat violently and rapidly," early 14c., from Old French batre "to beat, strike" (11c., Modern French battre "to beat, to strike"), from Latin battuere, batuere "to beat, strike," a rare word in literary Latin but evidently an old one and popular in Vulgar Latin. Probably borrowed from Gaulish (compare Welsh bathu "beat," Irish and Gaelic bat, bata "staff, cudgel") and perhaps from PIE root *bhau- "to strike." (source also of Welsh bathu "beat;" Old English beadu "battle," beatan "to beat," bytl "hammer, mallet").

The word began to be widely used in reference to domestic abuse in 1962. Related: Battered; battering. Battering-ram is an ancient weapon (Latin aries), but the phrase is attested only from 1610s.
hors de combat (adv.)
1757, French, literally "out of combat." Hors (prep.) "out, beyond," is from Latin foris (adv.) "outside," literally "out of doors" (see foreign). De is from Latin de "of." For combat see combat (n.). A similar expression from French is hors concours "out of competition" (1884), of a work of art in an exhibition.
combatant 

mid-15c. (adj.) "contending, disposed to combat;" late 15c. (n.) "one who engages in battle;" from Old French combatant (Modern French combattant) "skilled at fighting, warlike" (also used as a noun in Old French), present-participle adjective of combattre (see combat (v.)).

combative (adj.)

"pugnacious, disposed to fight," 1819, from combat (v.) + -ive. In 1820s-30s, much associated with phrenology. Related: Combatively; combativeness (1815).