sell somebody short

sell somebody ˈshort

cheat somebody by giving them less than they have paid for: He sold us short! We paid for five kilos of mushrooms and only got four!
See also: sell, short, somebody

sell yourself/somebody/something ˈshort

describe yourself/somebody/something as being less good, valuable, etc. than you, etc. really are: Don’t sell yourself short when you go for an interview.It was a great idea, but you sold it short.