Etymology
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run-in (n.)

"quarrel, confrontation," 1905, from the verbal phrase; see run (v.) + in (adv.). From 1857 as "an act of running in," along with the verbal phrase run in "pay a short, passing visit." Earlier to run in meant "to rush in" in attacking (1815).

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Definitions of run-in

run-in (n.)
an angry dispute;
Synonyms: quarrel / wrangle / row / words / dustup
From wordnet.princeton.edu