to intervene / engage
Loading your saved state.
to intervene
To actively get involved in a situation or conflict in order to influence its course, prevent escalation, or bring about a change.
Als der Streit eskalierte, musste die Polizei eingreifen.
When the argument escalated, the police had to intervene.
to engage
In technology, the meshing of moving parts, especially gears, in order to transmit force or movement.
Die Zahnräder des Getriebes müssen präzise ineinander eingreifen, damit es funktioniert.
The gears of the transmission must engage precisely with one another for it to work.
'Eingreifen' (to intervene/engage) is a separable verb with the prefix 'ein-'. In a main clause, 'greifen' stands in position 2 and 'ein' at the end. In a subordinate clause, 'eingreift' stands together at the end.
Der Schiedsrichter griff sofort ein.
The referee intervened immediately.
The verb is made up of 'ein-' and 'greifen' (to grab). The literal meaning 'hineingreifen' (to reach into) helps you understand the figurative meaning 'sich einmischen' (to get involved/interfere) or 'intervenieren' (to intervene).
Manchmal ist es besser, nicht in fremde Angelegenheiten einzugreifen.
Sometimes it is better not to intervene in other people's affairs.
When describing what one intervenes in, the preposition 'in' with the accusative is usually used. The pattern is: 'in eine Situation / einen Konflikt eingreifen' (to intervene in a situation / a conflict).
Die Eltern griffen in den Streit ihrer Kinder ein.
The parents intervened in their children's argument.
You can usually recognize the technical meaning from the context (machines, transmissions) and often from the combination with the adverb 'ineinander' (with one another / into each other). It describes how parts work together mechanically.
Die beiden Zahnräder greifen perfekt ineinander ein.
The two gears engage perfectly with one another.
to switch on / involve
Eingreifen means actively influencing a situation, for example to stop an argument. Sich einschalten can also mean simply entering a matter or conversation and contributing something. Eingreifen is more appropriate for a specific corrective action.
Als der Streit immer lauter wurde, griff die Lehrerin ein und trennte die beiden Schüler.
When the argument grew louder and louder, the teacher intervened and separated the two students.
Als die Klasse über den Streit sprach, schaltete sich die Lehrerin mit einem Vorschlag ein.
When the class was talking about the argument, the teacher joined in with a suggestion.
