1) Magsubok ka ng ilang pantalon bago natin bayaran. (You should try on some pants before we pay for it.) 2) Subukin mo kung pwede ang gusto mo. (Try and find out if what you want will work.)
source: Large Tagalog Dictionary
Active Verb: manubok
English Definition: (verb) to spy on
Huwag kang manubok ng iyong asawa. (You should not spy on your spouse.)