This is the 13251st most frequent German word.
aufzuspüren
"Aufzuspüren" means "to track down" or "to detect."
The word 'aufzuspüren' is used here in the sense of locating or finding something or someone after a thorough search.
Die Polizei versucht, den Täter im Stadtgebiet aufzuspüren.
The police are trying to track down the perpetrator in the city area.
Here, 'aufzuspüren' is used metaphorically, implying the discovery or uncovering of information or knowledge.
Forscher hoffen, in alten Texten vergessene Rezepte aufzuspüren.
Researchers hope to trace forgotten recipes in old texts.
In this case, 'aufzuspüren' describes the action of a dog finding persons by scent or trail as part of a search and rescue scenario.