From Longman Dictionary of Contemporary Englishhighway robberyhighway robberyAmerican English informal a situation in which something costs you a lot more than it should It’s highway robbery, charging that much for gas! → highway
Examples from the Corpus
highway robbery• At the end highway robberies, riots and an unspecified sense of comeuppance is what we are left with.• This brother-in-law was eventually hanged for highway robbery.• A matter of murder-more than one murder, highway robbery and probably the rape of a young girl too.• She says it's highway robbery.• Sixty dollars for a textbook? That's highway robbery.• The constable left in charge of Burford was reluctant to take any action, even when Seb reported the highway robbery at Swinbrook.From Longman Business Dictionaryhighway robberyˌhighway ˈrobbery noun [uncountable] informal a situation where something costs much more than it shouldIn my opinion, their pricing is highway robbery. 