to blunt
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to blunt
To remove or reduce the sharpness or point of an object, usually a tool such as a knife. To make something less sharp or pointed.
Der harte Stein stumpfte die Klinge der Axt.
The hard stone blunted the blade of the axe.
The verb 'stumpfen' (to blunt) is the action corresponding to the adjective 'stumpf' (blunt/dull). When you 'stumpfen' something, you make it blunt.
Pass auf, dass du das Messer nicht an dem harten Material stumpfst.
Be careful not to blunt the knife on the hard material.
'Stumpfen' (to blunt) is usually used transitively, meaning it requires an accusative object. Someone or something blunts something else.
Häufiger Gebrauch hat die Schere gestumpft.
Frequent use has blunted the scissors.
Typical objects that are blunted are sharp tools or objects. These include 'eine Klinge' (a blade), 'ein Messer' (a knife), 'eine Schere' (scissors), or 'eine Spitze' (a point/tip).
Der Koch muss seine Messer regelmäßig schärfen, da sie schnell stumpfen.
The cook has to sharpen his knives regularly because they become blunt quickly.
to grind / drag
'schleifen' and 'stumpfen' both have to do with the sharpness of a tool or knife, but they describe opposite results. When you 'schleifen' a knife, it becomes sharper or smoother. When something 'stumpft' a knife, it becomes less sharp. Learners may confuse the words because both occur with blades and tools. Remember: 'schleifen' makes something sharp; 'stumpfen' makes something dull.
Das Schneiden auf dem harten Teller stumpft die Klinge schnell.
Cutting on the hard plate quickly dulls the blade.
Vor dem Kochen schleift Mehmet das Messer, damit er das Gemüse leichter schneiden kann.
Before cooking, Mehmet sharpens the knife so he can cut the vegetables more easily.