verb
to happen, to occur
B1
Ereignen means 'to happen' or 'to occur'. It is used reflexively as sich ereignen. It is a regular (weak) verb and forms the perfect with haben (hat sich ereignet). Not separable. Commonly used for events: Ein Unfall ereignete sich gestern.
Examples
Es hat sich etwas Besonderes ereignet.
Something special happened.
Das Unglück ereignete sich gestern.
The accident happened yesterday.
Ein Unfall hat sich gestern auf der Autobahn ereignet.
An accident occurred on the highway yesterday.
Details
Mnemonics
Picture an event suddenly lighting up on a timeline — something 'ereigns' (occurs).
Sounds like 'event' (ereign-) if you focus on the root — think 'a re-ignite of events'.
Notes
ereignen is commonly used reflexively (sich ereignen) and is typical in formal or news contexts (e.g., 'Es hat sich ein Unfall ereignet'). It is usually intransitive and often appears with impersonal subjects. Passive forms are not applicable because the verb is intransitive/reflexive and does not form a normal (agentive) passive.