trade-up 
noun
A sale of an article in order to buy something similar but more expensive and of higher quality.Each group identified trades that achieved improved balance across its programs and then prioritized trade-ups and trade-offs for the group as a whole....
- They offer the same benefits their full-scale brothers do: a trade-up from premium domestics.
- Because of the effectiveness of sprinkler systems, codes often allow trade-offs or trade-ups on other elements of the fire protection system.
- water serpent
- Waters, Ethel
- water shaft
- watershed
- water shelf
- water shield
- water ship
- water shoot
- water shrew
- water shrimp
- water shute
- water sickness
- waterside
- watersider
- waterside worker
- water sign
- watersilk
- water sill
- water sink
- water skater
- water skeeter
- waterski
- waterskier
- water sky
- water slater