rash / deciding factor / deflection
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rash
A visible change in the skin, often in the form of redness, pustules, or spots, caused by an illness, allergy, or irritation.
Nach dem Essen der Erdbeeren bekam er einen juckenden Ausschlag am ganzen Körper.
After eating the strawberries, he got an itchy rash all over his body.
to be decisive
To be the decisive factor or reason that leads to a particular decision or result.
Das gute Gehalt gab den Ausschlag für seine Entscheidung, die Stelle anzunehmen.
The good salary was the decisive factor in his decision to accept the position.
deflection
The movement of a pointer on the scale of a measuring device, for example on a speedometer, scale, or seismograph.
Der Ausschlag des Seismographen zeigte ein leichtes Erdbeben an.
The deflection of the seismograph indicated a slight earthquake.
The noun 'der Ausschlag' (rash/deflection) is derived from the verb 'ausschlagen'. This verb can mean that something breaks out, as with a skin rash, or that a pointer moves. This explains both the medical and the technical meanings.
Der Zeiger der Waage schlug stark aus.
The pointer on the scale deflected strongly.
The meanings of 'Ausschlag' (rash/deciding factor/deflection) are easy to distinguish from context. It is either about medicine (skin), decisions (the decisive reason), or technology (measuring devices).
Der Arzt untersuchte den Ausschlag auf ihrem Arm.
The doctor examined the rash on her arm.
In medical contexts, 'Ausschlag' (rash) is often used with the verbs 'bekommen' (to get) or 'haben' (to have). Typical adjectives are 'juckend' (itchy), 'rot' (red), or 'allergisch' (allergic).
Er hat nach dem Sonnenbad einen roten Ausschlag bekommen.
He got a red rash after sunbathing.
The meaning 'decisive reason' exists only in the fixed expression 'den Ausschlag geben' (to be the deciding factor). The subject of the sentence is the decisive factor.
Seine Erfahrung gab den Ausschlag für die Beförderung.
His experience was the deciding factor for the promotion.
