
dichten
to write poetry
To compose literary texts, especially poems or other works of poetry.
Schon als Kind liebte sie es, kleine Gedichte zu dichten.
Even as a child, she loved writing little poems.
to write poetry / to seal / to make up
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to write poetry
To compose literary texts, especially poems or other works of poetry.
Schon als Kind liebte sie es, kleine Gedichte zu dichten.
Even as a child, she loved writing little poems.

to seal
To seal something; to close joints, cracks, or gaps so that no liquid or air can pass through.
Der Handwerker muss das undichte Fenster dichten, bevor es wieder regnet.
The craftsman has to seal the leaky window before it rains again.

to make up
Colloquial for lying or making something up; to invent a story that does not correspond to the truth.
Glaub ihm kein Wort, der dichtet sich doch nur etwas zusammen.
Don't believe a word he says; he's just making something up.
The verb 'dichten' has two different origins. On the one hand, it belongs to the word family of 'Dichter' (poet) and 'Gedicht' (poem), in literature. On the other hand, it is related to the adjective 'dicht' (tight, sealed) and means 'abdichten' (to seal).
Goethe hat viele berühmte Balladen gedichtet.
Goethe wrote many famous ballads.
In the meaning 'abdichten' (to seal), the verb is used for practical, manual tasks. Typical objects are 'ein Dach' (a roof), 'ein Fenster' (a window), 'Fugen' (joints), or 'ein Leck' (a leak).
Der Handwerker hat das Leck in der Wasserleitung schnell gedichtet.
The craftsman quickly sealed the leak in the water pipe.
The meaning 'lügen' (to lie) is colloquial. It is often used in the reflexive construction 'sich (dative) etwas zusammen dichten', which means 'to make up a story'.
Er hat sich nur eine Ausrede zusammengedichtet, warum er zu spät war.
He just made up an excuse for why he was late.
to write
Both words can refer to composing a poem. Schreiben is neutral and can express the writing process or authorship, while dichten explicitly emphasizes poetic creation. Schreiben is suitable for a general text; for a poem, dichten is especially appropriate.

Sie dichtet gerade ein Gedicht über ihre Reise.
She is currently writing a poem about her trip.
Sie schreibt gerade einen Text über ihre Reise.
She is currently writing a text about her trip.