1. Free Up:
McMillian says, “You free up your time so that you can take on tasks that come up unexpectedly.”
If we free up something, we make something available that was occupied or in use.
Such as, ‘I can free up some time on Friday for coffee.’ Or, ‘I threw away some clothes to free up space in my drawers.’
2. Take On a Task:
Tackle some task; handle it.
Things like, ‘He shouldn’t take on another project. He’s already too busy.’ Or, ‘She’s taken on a big translation job.’
3. In General:
Collins says, “You’re seen as trustworthy and reliable which can be good for your life in general.”
This has two basic meanings. Here it’s overall; the entire subject. Drinking a lot of water is good for your health in general I’ve heard. There are benefits for different elements of your health.
In general can also mean, usually; for the most part. In general Tokyo summers are quite humid.
Lyons says, “But isn’t there a downside to being a precrastinator.”
A negative aspect.
Things like, ‘One of the downside of this job is the constant travel.’ And upside means a positive aspect, as in, ‘One of the Upsides of this job is the generous maternity leave.’
5. Mess Up:
Ueda says, “Sometimes I mess up because I try to finish a project too fast.”
Make a mistake; blunder. I’ve seen this once or twice as a noun with a hyphen between mess and up. But, I don’t think that’s a very common usage.
It’s much more common to say things like, ‘I messed up terribly. The data in my presentation were all wrong.’