to file / refine
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to file
To work on a surface or workpiece made of metal, wood, or another hard material with a file in order to smooth it, shape it, or remove material.
Der Schlosser feilte die Kanten des Metallstücks glatt.
The locksmith filed the edges of the metal piece smooth.
to refine
To work intensively on something (e.g., a text, a speech, a skill) in order to improve and perfect it.
Sie hat wochenlang an ihrer Abschlusspräsentation gefeilt.
She spent weeks refining her final presentation.
The two meanings can be distinguished well by the grammar. The literal meaning has a direct accusative object (e.g., 'das Metall feilen' — to file the metal), while the figurative meaning always uses the preposition 'an' with the dative (e.g., 'an der Rede feilen' — to refine the speech).
Er feilt das Holzstück für sein Modellboot.
He is filing the piece of wood for his model boat.
When 'feilen' is used in the figurative sense of 'to improve' or 'to perfect', it is always used with the preposition 'an' followed by a dative object.
Der Redner hat lange an seinem Vortrag gefeilt.
The speaker spent a long time refining his talk.
In the literal meaning, 'feilen' (to file) is often used with hard materials such as 'Metall' (metal) or 'Holz' (wood). The phrase 'sich die Fingernägel feilen' (to file one's fingernails) is also very common in the cosmetic context.
Vor dem Lackieren feilt sie sich immer die Nägel.
Before applying nail polish, she always files her nails.
In the figurative meaning, abstract things are 'gefeilt' (refined). Typical objects are 'ein Plan' (a plan), 'eine Rede' (a speech), 'ein Text' (a text), 'eine Technik' (a technique), or 'eine Fähigkeit' (a skill).
Der Musiker feilt seit Wochen an seiner Technik.
The musician has been refining his technique for weeks.
to work
An einem Text arbeiten (to work on a text) does not specify whether the text is being planned, written, or changed. An einem Text feilen, on the other hand, means improving it through targeted small changes. Arbeiten fits the general activity; feilen fits fine-tuning.
Nora feilt nur noch an einzelnen Formulierungen ihrer Rede.
Nora is only refining individual phrases in her speech now.
Nora arbeitet noch am ersten Entwurf ihrer Rede.
Nora is still working on the first draft of her speech.
