Antonyms for messing up

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR MESSING UP

I'm hoping we will get our work done before they get poking their noses into it and messing up all the trails.

I expect the lake is flooding the whole place and messing up everything from our cellar to the chickenhouse.

I have jumbled memories of messing up on the ledge, and then half swamping just below it, on my former run.

I'd say Masters is playing safe keeping him from messing up the running gear while we're discharging.