Word meaning "to make more accurate"?

I'm looking for a single-word verb that means "to make more accurate".

The OED lists a word that might work, but the context is sort of restricted to an (in my opinion unfairly) small situation set. It lists the word accurize, which is fairly new (its first recorded use by the OED is from 1955), is originally & chiefly a US term, and means, "To adjust or modify (a firearm or (occas.) other device) in order to improve accuracy."

I can't find any other word that means the desired definition.

Solution 1:

Answers from comments that I completely agree with:

Refine: To improve in accuracy, delicacy, or excellence.

That's pretty much perfect.

Tighten: To make tighter.

With this definition of 'tight', or a similar one:

Tight: Well-rehearsed and accurate in execution.

We often say 'fine-tune' when talking about making something even more accurate, but 'tune' can be used as well, especially if the thing isn't very accurate to begin with.

Tune: To make more precise, intense, or effective; to put into a proper state or disposition.

_{Definitions from Wiktionary.}

Solution 2:

hone - to perfect or make more intense or effective
_{^{(thefreedictionary.com)}}

From Kiplinger's Personal Finance...

To hone the numbers further, figure out how much income you would need to replace each month if you lost your job

But in practice most people would probably use...

fine-tune - to make fine adjustments to (something) in order to obtain optimum performance
_{^{(thefreedictionary.com)}}

Solution 3:

General purpose verbs you could use would be "correct" and "rectify". But we need more context. If you're referring to improving the accuracy of some type of tool or instrument, then 'calibrate' would be the best choice.