This is the 3778th most frequent German word.
rückschlag
Setback.
"Rückschlag" here refers to an unanticipated adversity impacting someone's progress or situation.
Der plötzliche Rückschlag in seiner Karriere hat ihn sehr getroffen.
The sudden setback in his career affected him deeply.
In this sentence, "Rückschlag" denotes a significant hindrance or failure in the field of research or experimentation.
Nach jahrelanger Forschung erlebten die Wissenschaftler einen Rückschlag in ihrem Experiment.
After years of research, the scientists experienced a setback in their experiment.
"Rückschlag" is employed here to describe the physical action of a door suddenly coming back, showing a tangible rather than abstract application of the term.