infighter

WordReference Random House Learner's Dictionary of American English © 2026

in•fight•ing /ˈɪnˌfaɪtɪŋ/   n. [uncountable]

1. fighting at close range.
2. fighting between people closely associated:
   political infighting.

in•fight•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2026

in•fight•ing  (in′fī′ting), n. 

1. fighting at close range.
2. fighting between rivals, people closely associated, members of a group, etc.;
   internecine contention.
3. free-for-all fighting.

• in-¹ + fighting 1810–20

in′fight′er, n.