There's a specific word I'm looking for.
For example if there is some messy handwriting, and you're able to understand it what is says, you're able to [verb] it.
eg.
I got lost on the way here! I was unable to [verb] the last line of his instructions.
Sue has a speech impediment, but fortunately for her, her husband and colleagues were very good at [verbing] her speech when she was having a bad day.