Baretti: A dictionary of the English and Italian languages
Sottíle, s. m.
1. the thin part; 2. the delicate part of any thing; 3. necessity, extremity, strait, the worst. Recare un a —, to reduce one to straits or to a pinch. Guardar nel —,to be over-particular, to look too narrowly into things, to subtilize. Tornare al —, to return to the former wretched condition. Trarre il — del —, to waste nothing, turn all to advantage.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English