
der Stecher
stabber
A person who injures or kills another person with a stabbing weapon.
Die Polizei konnte den Stecher kurz nach der Tat festnehmen.
The police were able to arrest the stabber shortly after the crime.
stabber / biter / engraver
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stabber
A person who injures or kills another person with a stabbing weapon.
Die Polizei konnte den Stecher kurz nach der Tat festnehmen.
The police were able to arrest the stabber shortly after the crime.

biter / stinging insect
A colloquial term for an insect that bites or stings, especially a mosquito.
Am See wimmelt es nur so von diesen lästigen Stechern.
The lake is absolutely swarming with these annoying biters.

engraver
An artist or craftsperson who produces printing plates for intaglio printing by engraving a design into metal, such as copper, or wood; an engraver.
Albrecht Dürer war nicht nur Maler, sondern auch ein meisterhafter Stecher.
Albrecht Dürer was not only a painter, but also a masterful engraver.

set trigger
A special trigger mechanism in firearms that enables a very light and precise shot by greatly reducing trigger resistance.
Für den weiten Schuss auf das Wild benutzte der Jäger den Stecher seines Gewehrs.
For the long shot at the game, the hunter used the set trigger on his rifle.
All meanings of 'der Stecher' derive from the verb 'stechen' (to stab, sting, or prick). The suffix '-er' forms a noun that can refer to a person (perpetrator, artist), an animal (insect), or a tool (part of a weapon) that performs the action of stabbing, stinging, or pricking.
Eine Wespe ist ein Insekt, das stechen kann.
A wasp is an insect that can sting.
You can almost always recognize the meaning of 'Stecher' from the context. If it is about crime, it refers to the perpetrator. In nature, it means insects; in art, an engraver; and in shooting, a part of the weapon.
Der Jäger nutzte den Stecher für einen präzisen Schuss.
The hunter used the set trigger for a precise shot.
In connection with a crime, 'der Stecher' is often used with verbs such as 'suchen' (to look for), 'identifizieren' (to identify), 'fassen' (to catch), or 'festnehmen' (to arrest).
Die Polizei hofft, den Stecher bald identifizieren zu können.
The police hope to be able to identify the stabber soon.
The term 'Stecher' for a mosquito or another stinging insect is colloquial. It is often used when someone is annoyed.
Mach das Fenster zu, sonst kommen die ganzen Stecher rein!
Close the window, otherwise all those biters will come in!
In the meaning of a trigger mechanism, 'der Stecher' is a technical term from the language of hunters and sport shooters. Outside this context, you will hardly ever hear this meaning.
Er erklärte mir die Funktion des Stechers an seinem Jagdgewehr.
He explained the function of the set trigger on his hunting rifle to me.
deduction / trigger / withdrawal
Both words can refer to what is used to fire a shot. Abzug is the general mechanism of a firearm, while Stecher is a special trigger mechanism with greatly reduced trigger resistance. Abzug is used for the normal mechanism; the special version can be called Stecher.

Der Jäger stellte den Stecher des Gewehrs vor dem Schuss vorsichtig ein.
Before firing, the hunter carefully adjusted the rifle's set trigger.
Der Jäger legte den Finger vorsichtig an den Abzug des Gewehrs.
The hunter carefully placed his finger on the rifle's trigger.