intransitive verb

1. Obsolete to fight; battle; contend
2. to be antagonistic, incompatible, or contradictory; be in opposition; clash ideas that conflict

Etymology: ME conflicten < L conflictus, pp. of confligere, to strike together < com-, together + fligere, to strike: see inflict

noun

1. a fight or struggle, esp. a protracted one; war
2. sharp disagreement or opposition, as of interests or ideas; clash
3. emotional disturbance resulting from a clash of opposing impulses or from an inability to reconcile impulses with realistic or moral considerations
4. Rare collision of moving bodies