Phrasal Verb: Trade up
Meaning: Buy larger or more expensive items
Example: British wine drinkers have TRADED UP over the last few years from cheap plonk to expensive wines.
Meaning: Leave your wife or husband and marry someone better looking, richer, etc
Example: She supported him for years while he was struggling, but when he hit the big time he left her and TRADED UP.
Other Phrasal Verbs
We have 6 phrasal verbs with 'TRADE'