(tr) to make (buildings, land, etc) more valuable by additions or betterment
3.
(intr; usually foll by on or upon) to achieve a better standard or quality in comparison (with): to improve on last year's crop
—n
4.
informal (Austral) on the improve improving
[C16: from Anglo-French emprouer to turn to profit, from en prou into profit, from prou profit, from Late Latin prōde beneficial, from Latin prōdesse to be advantageous, from pro-1 + esse to be]