Definitions
There are 2 meanings of the phrase
Highway Robbery.
Highway Robbery - as a noun
An exorbitant price
Example: "What they are asking for gas these days is highway robbery"
Robbery of travellers on or near a public road
Example Sentences
"The price of popcorn at the movie theater was highway robbery."
"The hotel charged $25 for a bottle of water, which felt like highway robbery."
"Paying $100 for a T-shirt is nothing but highway robbery."
"The repair shop charged me $500 for a simple oil change - it was absolute highway robbery!"
"The taxi driver tried to charge me $50 for a 5-minute ride - that's just highway robbery."