Baretti: A dictionary of the English and Italian languages
Spilláre, v. a.
1. to pierce, tap, or broach. — una botte, to pierce or tap a cask; 2. to taste by way of trial; 3. to spy, watch, dog, observe, worm out. — i disegni segreti del principe, nè lecito è, nè sicuro, nè può riuscire, it is neither lawful nor safe, nor easy to penetrate into the designs of princes; v. n. 1. to distil, drop or run by little and little; 2. to weep.— le carte al giuoco, to cheat at cards.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
spillare: to pin, to tacke, to claspe or hooke, to spill. Also to sneake or finde out with diligent search. Also as Spicchiáre. Also to breach as wine with a spigot.