Webster's Revised Unabridged Dictionary · 1913

Improve

Improve , transitive verb

[Prefix im- not + prove: compare Latin improbare, French improuver.]

1.
To disprove or make void; to refute. [Obsolete]
Neither can any of them make so strong a reason which another can not improve. — Tyndale
2.
To disapprove; to find fault with; to reprove; to censure; as, to improve negligence. [Obsolete] — Chapman
When he rehearsed his preachings and his doing unto the high apostles, they could improve nothing. — Tyndale

Improve , transitive verb

[Prefix in- in + prove, in approve. See Approve, Prove.]

1.
To make better; to increase the value or good qualities of; to ameliorate by care or cultivation; as, to improve land. — Donne
I love not to improve the honor of the living by impairing that of the dead. — Denham
2.
To use or employ to good purpose; to make productive; to turn to profitable account; to utilize; as, to improve one's time; to improve his means. — Shakespeare
We shall especially honor God by improving diligently the talents which God hath committed to us. — Barrow
A hint that I do not remember to have seen opened and improved. — Addison
The court seldom fails to improve the opportunity. — Blackstone
How doth the little busy bee Improve each shining hour. — I. Watts
Those moments were diligently improved. — Gibbon
True policy, as well as good faith, in my opinion, binds us to improve the occasion. — Washington
3.
To advance or increase by use; to augment or add to; -- said with reference to what is bad. [Rare]
We all have, I fear,... not a little improved the wretched inheritance of our ancestors. — Bp. Porteus

Improve , intransitive verb

1.
To grow better; to advance or make progress in what is desirable; to make or show improvement; as, to improve in health.
We take care to improve in our frugality and diligence. — Atterbury
2.
To advance or progress in bad qualities; to grow worse.
Domitian improved in cruelty. — Milner
3.
To increase; to be enhanced; to rise in value; as, the price of cotton improves.
Collocations (1)
To improve on or To improve upon , to make useful additions or amendments to, or changes in; to bring nearer to perfection; as, to improve on the mode of tillage.