collision / clash
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collision
An event in which two or more objects, often vehicles or people, crash into each other forcefully.
Bei dem Zusammenstoß der beiden Autos gab es zum Glück nur Blechschaden.
Fortunately, the collision between the two cars only caused damage to the vehicles.
clash
A heated conflict or confrontation between people or groups with opposing opinions or interests.
Es kam zu einem heftigen Zusammenstoß zwischen der Regierung und der Opposition.
There was a heated clash between the government and the opposition.
The word consists of 'zusammen' (together) and 'der Stoß' (the push/impact, from 'stoßen' (to push/bump)). So it literally describes an event in which things 'zusammenstoßen' (collide). This logic applies both to physical collisions and to conflicts.
Der Zusammenstoß der beiden Radfahrer war unvermeidbar.
The collision between the two cyclists was unavoidable.
The phrase 'es kommt zu einem Zusammenstoß' (a collision/clash occurs) is used very frequently. This impersonal construction is common in both formal and informal contexts.
Auf der Kreuzung kommt es häufig zu Zusammenstößen.
Collisions often occur at the intersection.
To name the parties involved, you usually use the preposition 'mit' (with) for the opponent or 'zwischen' (between) for two or more parties. This applies to both meanings of the word.
Ein Zusammenstoß mit einem LKW ist immer gefährlich.
A collision with a truck is always dangerous.
accident
Both words can be used for a traffic event involving vehicles. „Zusammenstoß“ refers specifically to the forceful impact, whereas „Unfall“ refers to the entire unintended event and its possible damage. Use „Zusammenstoß“ for the collision itself and „Unfall“ for the entire event.
Der Zusammenstoß der beiden Autos blockierte die Kreuzung.
The collision between the two cars blocked the intersection.
Der Unfall auf der Kreuzung führte zu einer langen Sperrung.
The accident at the intersection led to a lengthy closure.
