to compact / condense
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to compact
To make something more compact and solid through pressure or pressing. This can refer to materials such as soil, snow, or also gases.
Die Baumaschine verdichtet den Schotter für das Fundament.
The construction machine compacts the gravel for the foundation.
The verb 'verdichten' (to compact/condense) derives from the adjective 'dicht' (dense/tight). The prefix 'ver-' here describes a process or change, meaning the process of making something dense or becoming dense.
Durch den Regen verdichtete sich die Erde auf dem Weg.
Because of the rain, the soil on the path became compacted.
This verb can be used transitively or reflexively, which changes the meaning. 'Etwas verdichten' means to actively make something more compact. 'Etwas verdichtet sich' means that something becomes denser by itself.
Ein Bauarbeiter verdichtet den Sand mit einer Rüttelplatte.
A construction worker compacts the sand with a vibrating plate.
In this meaning, 'verdichten' (to compact) is often used with building materials or natural substances. Typical objects are 'den Boden' (the ground/soil), 'den Schnee' (the snow), 'den Untergrund' (the subsoil/base), or 'das Erdreich' (the soil/earth).
Die Wanderer haben den Schnee mit ihren Schritten verdichtet.
The hikers compacted the snow with their steps.
The reflexive form 'sich verdichten' (to thicken/intensify) is used both for visible phenomena and for abstract ideas. People speak of fog that thickens, but also of clues or a suspicion that intensify or accumulate.
Die Hinweise, dass er der Täter war, verdichteten sich.
The clues that he was the perpetrator intensified.
In the context of texts and stories, 'verdichten' (to condense) means to reduce complex content to the essentials. You can condense 'Informationen' (information), 'eine Handlung' (a plot), or even 'die Atmosphäre' (the atmosphere) in a novel.
Die Regisseurin verdichtet die komplexe Romanvorlage zu einem 90-minütigen Film.
The director condenses the complex novel into a 90-minute film.
to summarize / group
'zusammenfassen' and 'verdichten' can both mean that a text or content becomes shorter and only the important parts remain. 'zusammenfassen' is the normal word in everyday life, at school, or in meetings. You briefly present the main points. 'verdichten' sounds stronger and often a bit more formal or creative: a text, a story, or a lot of information is made very compact. Learners may confuse the words because both have to do with shortening. For a normal brief summary, 'zusammenfassen' usually fits; 'verdichten' fits better when the content is made especially concentrated and concise.
Der Autor verdichtet die ganze Familiengeschichte auf nur zehn Seiten.
The author condenses the whole family history into just ten pages.
Lisa fasst den langen Text für die Prüfung in wenigen Sätzen zusammen.
Lisa summarizes the long text for the exam in a few sentences.