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.
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.
reason / ground
'der Grund' and 'der Ausschlag' are connected when it comes to decisions or results. 'der Grund' is generally the cause or reason for something. 'den Ausschlag geben' is a fixed expression and means: a particular point is ultimately decisive. Often there are several reasons, but one of them 'gibt den Ausschlag' (is the deciding factor). Learners may confuse the words because both explain why something happens. 'Grund' is neutral and general. 'den Ausschlag geben' emphasizes the final or decisive factor.
Der kurze Weg zur Schule gab den Ausschlag für diese Wohnung.
The short distance to the school was the deciding factor for this apartment.
Der wichtigste Grund für den Umzug ist die neue Arbeit.
The most important reason for the move is the new job.