to get oneself into trouble / to crumble in
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to get oneself into trouble
Colloquial for: to cause oneself difficulties, trouble, or an unpleasant situation through one's own careless actions or words.
Mit dieser unbedachten Lüge hat er sich eine Menge Ärger eingebrockt.
With that careless lie, he got himself into a lot of trouble.
to crumble in
To put solid food, usually bread or rusk, into a liquid such as soup, milk, or coffee in small pieces.
Mein Großvater hat sich früher immer altes Brot in die Gemüsesuppe eingebrockt.
My grandfather used to crumble old bread into his vegetable soup.
'Einbrocken' (to get oneself into trouble / to crumble in) is a separable verb. The prefix 'ein-' comes at the end in a main clause; in subordinate clauses and in the infinitive, it is attached to the verb. In the infinitive construction with 'zu', 'zu' comes between the prefix and the verb.
Was hast du dir denn da schon wieder eingebrockt?
What have you gotten yourself into again?
The word consists of the prefix 'ein-' and the verb 'brocken', which means 'to break into pieces'. The basic idea is that you put pieces (of bread or problems) into something.
Früher brockte man sich oft Brot in die Milch ein.
In the past, people often crumbled bread into their milk.
In the colloquial meaning, the verb is always used reflexively with a dative pronoun: 'sich (Dativ) etwas (Akkusativ) einbrocken' (to get oneself something). The person who causes the problem is in the dative.
Durch seine Faulheit hat er sich eine schlechte Note eingebrockt.
Because of his laziness, he got himself a bad grade.
The figurative meaning of getting oneself into trouble clearly belongs to colloquial language. In formal or written contexts, other formulations would be chosen.
„Das hast du dir schön selbst eingebrockt!“, sagte seine Mutter.
'You really brought that on yourself!', his mother said.
You can recognize the literal meaning from the fact that it is about food, usually bread, rusk, or something similar being put into a liquid. This use is rather rare today and often sounds old-fashioned.
Der Opa brockte sich jeden Morgen Zwieback in seinen Kaffee ein.
Grandpa crumbled rusk into his coffee every morning.
to light / ignite
Anzünden is used figuratively here for deliberately triggering an argument. Sich etwas einbrocken, by contrast, means causing trouble or difficulties for yourself through your own behavior. The consequences may be related, but anzünden focuses on the argument, while einbrocken focuses on the unpleasant situation you have got yourself into.
Mit seiner unbedachten Bemerkung brockte sich Paul großen Ärger ein.
With his thoughtless remark, Paul got himself into serious trouble.
Mit seiner unbedachten Bemerkung zündete Paul einen Streit an.
With his thoughtless remark, Paul ignited an argument.
