oslepáriti to swindle (koga someone)
oslepáriti koga za kaj to cheat someone out of something
osleparil me je za 50 funtov he swindled (ali cheated) me out of fifty pounds, žargon he ripped me off for fifty quid
biti osleparjen to be swindled, (žargon) to be sold a pup
osleparili so ga za 5 funtov (žargon) he was stung for a fiver