clash Definition

clash
noun

1. A loud noise, like that of metal objects striking each other.

Thesaurus: crash, smash.
2. A serious disagreement; a quarrel or argument.

Thesaurus: disagreement, encounter, conflict, opposition, argument, confrontation, dispute.
3. A fight, battle or match.
4. The coinciding of two or more events, both or all of which one ought to or would like to attend.

verb clashes, clashed, clashing

tr & intr
1. Said of metal objects, etc: to strike against each other noisily.
intr
2. To fight; to have a battle.
intr
3. Said of commitments, etc: to coincide, usually not fortuitously.
intr
4. Said of colours, styles, etc: to be unpleasing or unharmonious together.

Etymology: 16c: imitating the sound.

Phrasal Verb: clash with someone

To disagree with them violently.