Etymology
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in-fighting (n.)

1816, in pugilism, the practice of getting at close quarters with an opponent; see in + fighting. Old English infiht (n.) meant "brawl within a house or between members of a household." Middle English had infight (v.) "to attack" (c. 1300); the modern verb infight "fight at close quarters" (1916) appears to be a back-formation from in-fighting. Related: In-fighter (1812).

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Definitions of in-fighting

in-fighting (n.)
conflict between members of the same organization (usually concealed from outsiders);
in-fighting (n.)
boxing at close quarters;
From wordnet.princeton.edu