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“clash” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

clash
TR., collidere. INTR. :
PROPR., dash against each other, collidi (inter se): concurrere inter se (run together; e.g., of two ships): with anything, offendere aliquid. IMPR.,
in a hostile manner, inter se collidi (of things): concurrere: together, inter se; with anybody, cum aliquo (in conflict; e.g., of soldiers). To clash (of litters), aspere concurrere: if two consonants clash together, si binae consonantes collidantur (Quint., 9, 4, 37): inter se concurrere (of simply coming together; but Krebs is wrong in saying that collidere is never used of letters and syllables).
Be at variance; be inconsistent, inter se pugnare, repugnare, discrepare or dissidere. His actions clash with his words, facta ejus cum dictis discrepant. The answers (of the witnesses) clash, non congruentia respondent. Take care not to put together “clashing metaphors,” id in primis est custodiendum ut, quo ex genere coeperis translationis, hoc desinas (Quint.). “Clashing metaphors” (Addison), inconsequentia translationum (after Quint., B, 6, 50).
To make a clashing sound, increpare (of arms, Ov.; of a discus, Cic.).
clash s.
CLASHING, s. collision, concursio: concursus (the running together; e.g., of ships, enemies, etc., the former as act, the latter as state or thing): conflictio (Cic. and Quintilian, e.g., duorum inter se corporum, Quint.). The clashing together of letters, litterarum aspera concursio (Cic.): collisus (Plin.), collisio (Just.), are both post-Augustan.
Discrepance; hostile opposition, etc., repugnantia: pugna: discrepantia (e.g., scripti et voluntatis): diversitas.

Quick answer

What is the Latin word for clash?
The usual Latin words for “clash” are collīdō, concurrō, repugnō; also discrepō, dissideō, increpō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.