Answer: tradeup

AnswerCrossword Clue
TRADEUP

Get the better end of a deal, say

TRADEUP

Swap the old for the new

TRADEUP

Switch to a better model

TRADEUP
Replace one's old car with a better one, say
TRADEUP
Exchange for a better model
TRADEUPGet something better
TRADEUPGet a bigger car, say
TRADEUPBargain adroitly