Definition from Wiktionary, the free dictionary
See also: selldown
- (intransitive, Britain, business) To become less by being sold.
- Don't order any potato cakes for 3 days while what we have sells down.
- (transitive, Britain, business) To reduce by selling.
Shortening of sell down the river
- (idiomatic) To betray a person; to conspire against someone for personal gain.